C1-our changing Planet

Question 1

Why should we be careful not to waste the earth’s resources?

Answer 1

The resources are limited

Question 2

Name three gases that scientist think were in the earth’s early atmosphere?

Answer 2

Carbon dioxide, water vapour and nitrogen

Question 3

Name four gases that are now in the atmosphere the atmosphere

Answer 3

Nitrogen,oxygen and water vapour

Question 4

How did the oceans form?

Answer 4

When the Earth cooled water vapour condensed.

Question 5

What was the effect of algae and pants on the early atmosphere?

Answer 5

They removed carbon dioxide and produced oxygen

Question 6

a. What are tectonic plates?
b. Why do tectonic plates move?
c. About how much do they move in a year?
d. What happens at plate boundaries?

Answer 6

a. Large pieces of the Earth’s crust and upper mantle
b. There are convection currents in the mantle caused by heating of the mantle by energy from radioactive decay of elements deep in the earth
c. A few centimeters
d. Earthquakes, volcanoes and mountains form.

Question 7

Name the main parts of the earth, starting from its centre.

Answer 7

Core,mantle,crust,atmosphere