Structure Of The Earth

Question 1

The restless earth

Answer 1

The earths crust and upper mantle consists of plates which are constantly moving by convention currents and so you get earthquakes volcanoes and mountains where plates meet
Alfred Wegener continental drift 1915 developed into theory of plate tectonics.

Question 2

Earths atmosphere in the past

Answer 2

Earth formed 4.5 billion years ago
At first had volcanoes
And then as the earth cooled down water vapour condensed to form oceans
Then bacteria algae and plants evolved
which released oxygen

Question 3

Life on Earth

Answer 3

Plants producing oxygen evolved from plankton and Algae from the ancient oceans but we don’t know how the molecules of simple living things formed

Question 4

Gases in the atmosphere

Answer 4

Plants took up much of the carbon dioxide animals ate the plants and the carbon ended up in plant and animal remains as sedimentary rock and fossil fuels

Question 5

Carbon dioxide in the atmosphere

Answer 5

Carbon Dioxide moves into and out of the atmosphere due to plants, animals, the oceans and rocks. The carbon cycle shows this process. The amount of carbon dioxide has risen due to burning of fossil fuels.

Question 6

Structure of the earth summary

Answer 6

Layers
Atmosphere on the outside
Crust (5-70km)
Mantle mostly solid (3000km)
Outer-core which is liquid 
Inner-core which is solid