Earth

Question 1

Core is made from?

Answer 1

Nickel and iron
Outer part is liquid
Inner solid

Question 2

Crust

Answer 2

Thin

Question 3

Mantle

Answer 3

Has properties of a solid but also flow

Question 4

What causes radioactive decay of rocks inside the core

Answer 4

Convection currents in the mantle

Question 5

Wegener said..

Answer 5

Africa and SA once fit together

Question 6

Evidence from wegeners tectonic theory

Answer 6

Similar rock patterns
Similar fossil records
Once a single land mass

Question 7

What were the problems with his theory

Answer 7

Couldn’t explain how continental drift happened

didn’t know about heating from the core

Question 8

What causes continental drift

Answer 8

Earth generates mass amount of heat through radioactive decay in the core
Heat generated convection currents in the mantle causing the crust to move

Question 9

What causes earthquakes

Answer 9

Tectonic plates pushing against each other causing rocks to break releasing energy
Suddenly move/jolt releasing energy

Question 10

Why are earthquakes hard to predict

Answer 10

Occur deep underground

Don’t know when rocks with break

Question 11

What does volcanic activity release

Answer 11

CO2, methane, ammonia and water vapour into the atmosphere

Question 12

What does the ozone layer do

Answer 12

Blocks out harmful ultraviolet rays with allows development of new life

Question 13

Nitrogen is what %

Answer 13

78%

Question 14

Oxygen is what %

Answer 14

21%

Question 15

Nobel gases is what %

Answer 15

1%

Question 16

CO2 is what %

Answer 16

0.03%

Question 17

Miller-Urey experiment

Answer 17

Lightning caused a reaction between ammonia and hydrocarbons (methane)
He reacted these conditions and produced amino acids which are the basis of life
How life started

Question 18

3 parts of the earth?

Answer 18

Crust
Mantle
Core