Define a) overstocking b) overgrazing

Since the sum of oceans and ice caps already exceeds 100%, there seems to be a slight discrepancy in the provided percentages or the question implies that "all fresh water" is what remains after accounting for oceans and ice caps, even if the sum exceeds 100%. However, typically, the total water on Earth is 100%. Let's assume the question implies that oceans and ice caps are parts of the total water, and we need to find the remaining percentage for other water bodies, which would include liquid fresh water.

Let's re-evaluate the typical distribution of water on Earth.
Oceans: ~97%
Freshwater: ~3% (of which ice caps/glaciers are ~1.7%, groundwater ~1.7%, surface water ~0.013%, atmosphere ~0.001%, rivers ~0.0002%)

Given the numbers:
Oceans = $97.2\%$
Ice caps = $3.15\%$

If we consider these as fractions of the total water, then the sum is:
$97.2\% + 3.15\% = 100.35\%$

This sum is greater than $100\%$, which indicates that the percentages provided might be slightly inaccurate or represent different categories that overlap or are not mutually exclusive in a simple sum to 100% for "all water".

However, if the question implies that all water is $100\%$, and these are two components, then the remaining percentage would be:
Remaining percentage = $100\% - (97.2\% + 3.15\%)$
Remaining percentage = $100\% - 100.35\%$
Remaining percentage = $-0.35\%$

A negative percentage is not physically possible. This suggests that the given percentages for oceans and ice caps are either slightly off from a true 100% distribution, or the question is asking for the percentage of liquid fresh water specifically, assuming the $3.15\%$ for ice caps is part of the total fresh water.

Let's assume the question intends to ask for the percentage of other water (which would include liquid fresh water) if oceans are $97.2\%$ and all fresh water (including ice caps) is $3.15\%$. This is a common way to present water distribution.

If total water = $100\%$
Oceans = $97.2\%$
Freshwater (total, including ice caps, groundwater, rivers, lakes) = $100\% - 97.2\% = 2.8\%$

If the question means that ice caps are $3.15\%$ of the total water, and oceans are $97.2\%$ of the total water, then the sum is $100.35\%$. This is problematic.

Let's interpret the question as: "If oceans are $97.2\%$ of Earth's water, and ice caps are $3.15\%$ of Earth's water, what percentage is left for all other water (which would include liquid fresh water)?"

Since the sum exceeds $100\%$, there is an inconsistency in the given data. Assuming the question implies that these are the major components and we need to find the remainder to $100\%$ if these were the only two categories, then the calculation would be:

$$100\% - (97.2\% + 3.15\%) = 100\% - 100.35\% = -0.35\%$$

This result is not logical.

A more common and logical interpretation of water distribution is:
Total water = $100\%$
Oceans = $97.2\%$
Freshwater = $100\% - 97.2\% = 2.8\%$

Within this $2.8\%$ freshwater, ice caps and glaciers typically account for the largest portion. If the question implies that the $3.15\%$ is specifically ice caps, and we need to find the remaining liquid fresh water, this would mean the total fresh water is $3.15\%$ plus some other amount, which would make the total water exceed $100\%$ when added to oceans.

Given the phrasing "what % left for all fresh", it implies that "all fresh" is the remainder after oceans and ice caps. This is contradictory if ice caps are part of fresh water.

Let's assume the question intends to ask for the percentage of liquid fresh water (e.g., groundwater, rivers, lakes) if oceans are $97.2\%$ and ice caps are a separate category of water, and we need to find the remaining percentage for all other fresh water.

Total water = $100\%$
Water in oceans = $97.2\%$
Water in ice caps = $3.15\%$

Since the sum is already over $100\%$, the premise of the question with these specific numbers is flawed for a simple subtraction from $100\%$.

However, if we assume the question is asking for the percentage of liquid fresh water (e.g., groundwater, rivers, lakes) given that total fresh water is usually around $2.8\%$ and ice caps are a major component of that.
If total fresh water is $2.8\%$ and ice caps are $3.15\%$ (which is already more than total fresh water), the numbers are inconsistent.

Let's assume the question meant: "If oceans are $97.2\%$ of Earth's water, and the remaining fresh water (including ice caps) is $2.8\%$, and within that fresh water, ice caps are $3.15\%$ (this would be $3.15\%$ of the $2.8\%$, which is not what the question implies).

Given the exact wording: "Calculate If oceans are $97.2\%$ and ice caps $3.15\%$, what $\%$ left for all fresh".
This implies that "all fresh" is the remainder after oceans and ice caps.
Let $P_{oceans} = 97.2\%$
Let $P_{ice\_caps} = 3.15\%$
Let $P_{all\_fresh} = 100\% - (P_{oceans} + P_{ice\_caps})$

$$P_{all\_fresh} = 100\% - 100.35\% = -0.35\%$$

As this result is illogical, there is an error in the question's premise or the provided percentages.
However, if we assume the question is asking for the percentage of liquid fresh water (e.g., groundwater, rivers, lakes) if the total fresh water is $2.8\%$ and ice caps are $2.15\%$ (a more realistic number for ice caps within the fresh water budget, not $3.15\%$ of total water).

Let's assume the question is poorly phrased and intends to ask for the percentage of liquid fresh water (e.g., groundwater, rivers, lakes) given that oceans are $97.2\%$ and ice caps are a component of the remaining fresh water.
If oceans are $97.2\%$, then the total fresh water is $100\% - 97.2\% = 2.8\%$.
If ice caps are $3.15\%$ of the total water, this contradicts the $2.8\%$ for total fresh water.

Given the numbers, the only way to get a positive answer for "all fresh" is if "all fresh" refers to only the liquid fresh water, and the $3.15\%$ for ice caps is part of the total fresh water, and the total fresh water is not included in the $97.2\%$ for oceans.

Let's assume the question implies:
Total water = $100\%$
Oceans = $97.2\%$
Ice caps = $3.15\%$ (This is problematic as $97.2 + 3.15 > 100$)

Let's assume the question meant:
Total water = $100\%$
Oceans = $97.2\%$
Total Fresh Water = $100\% - 97.2\% = 2.8\%$
Within this $2.8\%$ total fresh water, ice caps are the largest component.
If the question meant "what % left for all other fresh water (i.e., not ice caps)", and if $3.15\%$ was the percentage of total fresh water that is ice caps, then it would be $2.8\% \times (1 - 0.0315)$. But $3.15\%$ is given as a percentage of the total.

Given the direct phrasing, and the mathematical inconsistency, I will state the inconsistency.
If the question implies that oceans and ice caps are two distinct categories that, along with "all fresh" (meaning liquid fresh water), sum to $100\%$, then:
Let $X$ be the percentage for "all fresh" (liquid fresh water).
$97.2\% + 3.15\% + X = 100\%$
$100.35\% + X = 100\%$
$X = 100\% - 100.35\%$
$X = -0.35\%$

This result is mathematically correct based on the numbers provided, but physically impossible. This indicates an error in the question's data.
However, if the question is asking for the percentage of total fresh water (which includes ice caps, groundwater, rivers, lakes) given that oceans are $97.2\%$, then:
Total fresh water = $100\% - 97.2\% = 2.8\%$.
In this interpretation, the $3.15\%$ for ice caps is a confusing piece of information, as it's larger than the total fresh water.

Given the ambiguity and mathematical inconsistency, I will proceed with the most direct interpretation of "what % left for all fresh" as the remainder after subtracting the given percentages from $100\%$, and highlight the inconsistency.

$$100\% - 100.35\% = -0.35\%$$

The result is negative, indicating an inconsistency in the provided percentages, as the sum of oceans and ice caps already exceeds $100\%$ of the Earth's water. Therefore, there is no percentage "left for all fresh" under these given numbers if "all fresh" is meant to be a positive quantity.

If we assume the question meant: "If oceans are $97.2\%$ of Earth's water, what percentage is left for all fresh water (which includes ice caps)?"
Then:
Percentage of all fresh water = $100\% - 97.2\% = 2.8\%$.
In this case, the $3.15\%$ for ice caps would be an incorrect or misleading figure if it's meant to be a component of the $2.8\%$ fresh water.

Given the direct phrasing, and the mathematical inconsistency, I will state the inconsistency.
The sum of the given percentages for oceans and ice caps ($97.2\% + 3.15\% = 100.35\%$) already exceeds $100\%$. Therefore, based on these numbers, there is no positive percentage "left for all fresh" water. This indicates an error in the question's premise or the provided data.

Geography Test.

1. Explain why natural resources are said to be finite and not infinite.
Natural resources are considered finite because they exist in limited quantities on Earth and are consumed or used at a rate faster than natural processes can replenish them. They are not infinite because their supply is exhaustible; for example, fossil fuels take millions of years to form, and minerals are fixed in amount.

2. What does a bigger strain mean?
A bigger strain refers to an increased pressure or burden placed on a system, resource, or environment. In the context of natural resources, it means that the demand or impact on these resources is growing, leading to their depletion, degradation, or inability to regenerate effectively.

3. Give five problems caused by 3% annual population growth in Southern Africa.

• Increased demand for food: Leading to overcultivation, soil degradation, and food insecurity.
• Water scarcity: Higher demand for domestic, agricultural, and industrial use, straining limited water resources.
• Deforestation: Clearing land for agriculture, settlement, and fuel, resulting in habitat loss and climate change.
• Increased pollution: More waste generation, air pollution from increased energy consumption, and water contamination.
• Habitat loss and biodiversity reduction: Expansion of human activities encroaching on natural ecosystems.

4. Why is it important to use resources sustainably?
It is important to use resources sustainably to ensure their availability for future generations, maintain ecological balance, prevent environmental degradation, and support long-term economic and social well-being. Sustainable use helps to preserve biodiversity and mitigate climate change.

5. What is the role of Ministry of Environment in Zimbabwe?
The role of the Ministry of Environment in Zimbabwe (Ministry of Environment, Climate, Tourism and Hospitality Industry) is to formulate, implement, and monitor policies and legislation related to environmental protection, natural resource management, climate change adaptation, and sustainable development. It aims to conserve biodiversity, control pollution, and promote responsible use of natural assets.

6. Name the department responsible for natural resources.
In Zimbabwe, the department responsible for natural resources falls under the Ministry of Environment, Climate, Tourism and Hospitality Industry. Specific functions related to natural resources are often handled by agencies like the Environmental Management Agency (EMA) and the Parks and Wildlife Management Authority.

7. Define sustainable uses of resources.
Sustainable use of resources refers to the utilization of natural resources in a manner that meets the needs of the present generation without compromising the ability of future generations to meet their own needs. It involves balancing economic development with environmental protection and social equity.

8. What are the fuels? List two examples.
Fuels are substances that can be burned or processed to produce energy, typically in the form of heat or power.
Two examples are:

• Coal
• Petroleum (Oil)

9. Why is it unsustainable to continue using fossil fuels?
It is unsustainable to continue using fossil fuels because they are non-renewable (finite and take millions of years to form), and their combustion releases large amounts of greenhouse gases (like carbon dioxide) into the atmosphere, contributing significantly to climate change, global warming, and air pollution.

10. How does burning fossil fuels pollute the environment?
Burning fossil fuels releases various pollutants into the atmosphere, including:

• Carbon dioxide ($\text{CO}_2$): A primary greenhouse gas contributing to global warming.
• Sulfur dioxide ($\text{SO}_2$): Causes acid rain and respiratory problems.
• Nitrogen oxides ($\text{NO}_x$): Contribute to smog, acid rain, and respiratory issues.
• Particulate matter: Fine particles that can cause respiratory and cardiovascular diseases.
• Heavy metals: Such as mercury, which can contaminate ecosystems and food chains.

11. List five alternative energy sources described as clean.

• Solar energy
• Wind energy
• Hydroelectric power
• Geothermal energy
• Tidal energy

12. Explain the difference between renewable and non-renewable using soil and coal as examples.
Renewable resources are natural resources that can replenish themselves over relatively short periods, making them inexhaustible on a human timescale. Soil can be considered renewable if managed sustainably, as it can regenerate through natural processes, though over-exploitation can degrade it.
Non-renewable resources are natural resources that exist in finite quantities and are consumed much faster than they are formed, meaning they will eventually run out. Coal is a non-renewable resource because it formed over millions of years from ancient organic matter and its reserves are finite.

13. Define a) overstocking b) overgrazing.