The Earth

Question 1

Name the three layers of the earth and some information about each.

Answer 1

1. Crust - thin and surrounded by atmosphere
2. Mantle - all properties of a solid, but, it can flow very slowly. Within radioactive decay takes place, which produces heat , caused by a convection current.
3. CORE - Iron and Nickel

Question 2

Which layer are the tectonic plates on?

Answer 2

Crust and upper part of mantle is cracked.

Question 3

What causes the plates to drift?

Answer 3

the convection currents in the mantle.

Question 4

In a year how much do they move by?

Answer 4

few cm per year

Question 5

what occur between two tectonic plates?

Answer 5

volcanoes and Earthquakes

Question 6

What are the clues for volcanoes erupting?

Answer 6

molten rock rises up into chambers near the surface, the ground bulges a little which can cause mini earthquakes

Question 7

In the simplest terms what does phase 1 consist of?

Answer 7

• Earth was molten
• It cooled down = thin crust formed.
• Volcanoes gave out gases –> oceans and atmosphere formed
• lots of CO(2) and hardly any O
• Water vapor (condensed = oceans) + methane + ammonia

Question 8

Phase 2?

Answer 8

• Green plant and algae -> absorbed some CO(2) + Produced 0(2) by photosynthesis
• They died + buried under sediment.
• Hydrocarbons and carbon locked up as insoluble carbonates and fossil fuels

Question 9

Phase 3?

Answer 9

• oxygen builds up which created the Ozone layer, which blocks harmful rays.
• we evolved
• virtually no carbon dioxide left

Question 10

Problems of burning fossil fuels

Answer 10

global warming

and makes oceans acidic