Oceans , Algae and Green Plants absorbed Carbon dioxide`

Question 1

Oceans , Algae and Green Plants absorbed ………..

Answer 1

CO2

Question 2

When water vapour in the atmosphere condensed forms ………..

Answer 2

oceans

Question 3

Lots of c02 was removed from the early atmosphere as it dissolved in …….

Answer 3

Oceans and became sediments (especially solid carbon compressed made sea bed floor and fossil fuels

Question 4

The dissolved c02 then goes through a series of a reaction to form

Answer 4

Carbonate precipitates that formed sediments on the sea bed

Question 5

Green plants and algae evolved and absorbed

Answer 5

some of the c02 so they can carry out photosynthesis.

2.7bn algae

Later marine animals evolved their shells and skeletons contain carbonates from ocean

Question 6

Some of the carbon these organisms took in from the atmosphere and oceans became locked up in

Answer 6

Rocks and fossil fuels after the organisms died

Question 7

How are fossil fuels made

Answer 7

When plants , plankton and marine animals die , they fall to the sea bed and get buried by layers of sediment . Over million of years become compressed and form sedimentary rocks , oil and gas- trapping carbon with them and help keep c02 levels in atmosphere are reduced

Things like coal(formed by plants), crude oil and natural gas are made by processed called by fossil fuels

Crude oil + natural gas formed from deposits of plankton fossil fuels form reservoirs under sea bed when trapped in rocks

Question 8

Coal is a sedimentary rock

Answer 8

thick plant deposits

Question 9

Limestone also sedimentary rock mostly made of

Answer 9

calcium carbonate deposits from shells and skeletons of marine organisms