What happens as more and more carbon leaves other reservoirs and enters the atmosphere?
question 4 options:

rocks turn into shells.

plants run out of air.

the atmosphere heats up.

volcanoes become less active.

The atmosphere heats up as more and more carbon leaves other reservoirs and enters the atmosphere,

Explanation:

During carbon cycle the carbon from the reservoirs is added into the atmosphere in the form of gases.As more and more carbon leaves the reservoirs, it is converted to gases such as carbon dioxide, carbon monoxide etc.Being a green house gas, carbon dioxide traps the heat that re-radiates from the Earths surface and keeps the atmosphere warm.So, when more carbon leaves the reservoir and enters the atmosphere ; the level of carbon dioxide increases and more heat is trapped.This results in heating up of the Earth's atmosphere.