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6. what is the diameter of the earth?
- about 12800km
- about 1280km
- about 128000km
- about 128km
7. what was the miller urey experiment called?
- primordial soup
- the miller urey experiment
- chemical soup
8. 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
9. How are elements arranged in the periodic table?
- in order of their atomic numbers
- in size order
- in the popularity
10. the mantle is ...?
- almost solid but parts of it can flow very slowly
- almost solid but most of it a liquid
11. What is the middle layer of the earth?
12. what did the miller urey experiment consist of?
- hydrocarbons and ammonia with lightning providing energy
- ammonia and carbondioxide with lightning providing sparks
13. what surrounds the earth?
- the crust
- the air
- the atmosphere
- the sky
14. neutrons have ..... charge
- no charge
- positive charge
- negative charge
- some charges
15. Group 0 consists of the ... gases?
- fluids
- hot gases
- noble gases
- metals
16. why do the tectonic plates move?
- because of global warming
- becasue of convection currents in the mantle that are caused by radioactive decay
- because of the world heating up
17. There are about .... different elements from which all substances are made?
18. where do earthquakes occur?
- where tectonic plates part
- where tectonic plates meet
- where tectonic plates crash
- where tectonic plate overlap
19. the atomic number is the amount of...?
- proton number
- electron number
20. what is the nucleus made of?
- protons and neutrons
- electrons and protons
- just protons
- just electrons