What is the purpose of the ozone layer in the Earth's atmosphere? State quantitatively, the: acceleration due to gravity at the surface of the Earth. density of water.

d) The purpose of the ozone layer is to absorb most of the Sun's harmful ultraviolet (UV) radiation, preventing it from reaching the Earth's surface. This protection is crucial for life on Earth, as UV radiation can cause skin cancer, cataracts, and harm to plants and marine ecosystems.

e)

i) The acceleration due to gravity at the surface of the Earth is approximately:

$$\boxed{9.81 \text{ m/s}^2}$$

ii) The density of water is approximately:

$$\boxed{1000 \text{ kg/m}^3}$$