Explain the layers of the Earth using an avocado as an analogy. List four resources from the Earth's crust, identify the tectonic plate Sri Lanka is on and explain why earthquakes are infrequent there

Here are the answers to your questions:

1. The sections of the avocado correspond to the Earth's layers as follows:

   • Avocado pit: Corresponds to the Earth's core.
   • Avocado flesh: Corresponds to the Earth's mantle.
   • Avocado skin: Corresponds to the Earth's crust.

2. I) Four resources obtained by man from the Earth's crust are:

   • Minerals (e.g., iron, copper, gold)
   • Fossil fuels (e.g., coal, petroleum, natural gas)
   • Building materials (e.g., sand, gravel, limestone)
   • Groundwater

   II) Sri Lanka is situated on the Indian Plate. Severe earthquakes do not occur frequently in Sri Lanka because it is located in the middle of a tectonic plate, far from active plate boundaries where most seismic activity takes place.

   III) Two methods used by geologists to obtain information about the internal structure of the Earth are:

   • Seismic wave analysis: Studying how earthquake waves (P-waves and S-waves) travel through the Earth, as their speed and path changes reveal the properties of different layers.
   • Analysis of volcanic materials: Studying the composition of magma and lava that erupts from volcanoes provides clues about the mantle's composition.

   IV) Three countries where earthquakes occur frequently are:

   • Japan
   • Indonesia
   • Chile