1. What is the middle layer of the earth?
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2. what shape is the earth?
- almost spherical
3. Why is the earths crust and upper mantle cracking?
- because of sea levels rising
- because of tectonic plates which are constantly moving
- because of volcanoes erupting
4. the earths limited resouces come from..?
- its crust , the oceans and the atmosphere
- the volcanoes
- the air particles that form layers on the earths atmosphere
5. what are chemical symbols used for?
- represent atoms
- contain atoms
- symbolise atoms
- show atoms