Types of Chemical Reactions Pt2

Question 1

What has caused an increase in the amount of CO2?

Answer 1

Burning fossil fuels

Question 2

What has the CO2 formed?

Answer 2

A blanket around the earth, trapping heat. Leading to global warming.

Question 3

Global warming has caused the temperature of the earth’s surface to rise by 1°C in the last 100 years. What has this lead to?

Answer 3

Melting polar ice caps destroying animal’s habitats

Increased flooding of low lying areas

Question 4

Which percentage of the air is a) Oxygen

                                              b) Nitrogen
                                              c) Other gases

Answer 4

a) 21%
b) 78%
c) 1%

Question 5

What is meant by Wegener’s theory of continental drift?

Answer 5

Originally the continents were one single land mass but 200 million years ago the land mass broke up and drifted apart.

Question 6

Why was Wegener’s theory not accepted by other scientists?

Answer 6

He couldn’t explain why or how the continents moved apart.

Question 7

What is the theory of plate tectonics?

Answer 7

Convectional currents in the earth’s mantle causes the continents to move.

Question 8

What causes an earth quake?

Answer 8

Stresses and strains when the plates rub past each other or one slips under the other.

Question 9

What causes a volcano?

Answer 9

When the plates move apart causing the Earth’s crust to be stretched. The crust may crack and molten magma and gases can escape resulting in a volcano.