The Climate

Question 1

How old is the earth?

Answer 1

4.6 billion years.

Question 2

What happened 4.6 billion years ago.

Answer 2

Volcanic activity releases CO2, methane, ammonia and water vapour into the atmosphere. Then when the earth cooled the water vapour turned into water to form oceans.

Question 3

What happened 2.7 billion years ago?

Answer 3

Green plants (algae) came from primordial soup in the ocean and are single celled. They did photosynthesis to create oxygen

Question 4

What happens 1 billion years ago?

Answer 4

Some oxygen turned into O3 which created the ozone layer. This blocks out harmful ultra violet rays which allows for life on land to begin.

Question 5

How has the amount of Carbon dioxide in the atmosphere gone down?

Answer 5

By dissolving in the oceans. Being taken in for photosynthesis. By being trapped in sedimentary rocks.

Question 6

How is there a balance between CO2 and O2

Answer 6

Photosynthesis creates oxygen takes in carbon dioxide but respiration and combustion do the opposite

Question 7

What is word equation for combustion?

Answer 7

Fuel ( eg a hydrocarbon)+ Oxygen -> water + carbon dioxide

Question 8

Equation for incomplete combustion

Answer 8

Fuel + limited supply of oxygen -> carbon monoxide + smoke + water