Question

determine whether each statement is true or false.
if the oceans absorb too much co₂ from the atmosphere, they can become more acidic, potentially causing the shells and exoskeletons of some marine organisms to dissolve.
much more carbon moves through the slow processes of the carbon cycle each year than through the fast processes of the carbon cycle.
runoff from the chemical weathering of rocks on land helps deliver ions to the oceans. many marine organisms use these ions to build their shells and exoskeletons.
processes that release carbon, like volcanic activity and fossil - fuel combustion, occur much faster than processes that store carbon underground, such as limestone formation and coal formation.

Explanation:

1. When oceans absorb too much CO₂, it forms carbonic acid, increasing ocean acidity which can dissolve the calcium - carbonate - based shells and exoskeletons of marine organisms. So the first statement is true.
2. The fast processes of the carbon cycle (like photosynthesis and respiration) move much more carbon each year than the slow processes (like fossilization and rock weathering). So the second statement is false.
3. Chemical weathering of rocks on land releases ions like calcium and carbonate which are carried by runoff to the oceans and used by marine organisms for shell - building. So the third statement is true.
4. Volcanic activity and fossil - fuel combustion release carbon quickly, while processes like limestone and coal formation store carbon slowly over long geological timescales. So the fourth statement is true.

Answer:

1. True
2. False
3. True
4. True