C1.5 Earth and the atmosphere

Question 1

continental drift

Answer 1

movement of tectonic plates

Question 2

wegners evidence

Answer 2

1. shapes of continents fit together ,like a jigsaw

2. .fossils are similar

Question 3

What causes the earths tectonic plates to move

Answer 3

1. radioactivity in the core releases heat energy
2. This makes mantle material less dense so it rises
3. This causes convection currents in the mantle

Question 4

CO2 has decreased becreased due to

Answer 4

==plants/microorganism
==3000 million years ago, simple plant life developed and by photosynthesis happening, the carbon dioxide concentration further dropped and oxygen produced
==dissolves i oxygen
==locked up in fossil fuels
==Shell formations in the oceans reduced carbon dioxide levels even more
==As the oceans absorbed the carbon dioxide, the carbon dioxide concentration in the
atmosphere fell dramatically

Question 5

The Carbon Cycle

Answer 5

The Carbon Cycle
• The carbon cycle shows how carbon rotates between the rocks, the oceans, and
the atmosphere
• The oceans absorb excess carbon dioxide and produce it when it is needed –
making them useful carbon dioxide ‘reservoirs’
• Plants also take in carbon dioxide during the process of photosynthesis
• Therefore, plants and the oceans play good carbon dioxide sinks
• Carbon dioxide is released back into the atmosphere when animals and plants
respire, as well as when dead animal bodies decompose