a hole in the ground that forms suddenly when water dissolves rock

harmful precipitation caused by the burning of fossil fuels

a substance added to soil to make it better for the growing crops

the process by which heat from the Sun builds up near Earth's surface and is trapped there by the atmosphere.

This gas is created when burning fossil fuels. It traps more heat that other gases in the air.

the slow increase in the earth's average temperature or our climate's temperature

the process by which a body of water becomes enriched in dissolved nutrients (such as phosphates) that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen

fresh water trapped inside the earth's crust.

an underground geological formation containing groundwater, supplying water for wells.

the level underground where earth materials, like soil and and rock are saturated with water

an energy resource that formed from the remains of living things that died millions of years ago. Oil, coal, and natural gas are these.

the movement of water from the oceans and land into the air and back again

What gas is produced or made by photosynthesis?