permanent gas

Subject:

the responsible harvesting and use of resources for development so that those resources are not...

leaching

Subject:

when excessive rainfall washes nutrients from the A horizon towards the bottom of the soil

air mass

Subject:

a large volume of air which has remained stationary in one area for a number of days and that...

Subject:

a thin, white, wispy cloud that forms high in the atmosphere

Subject:

plane between the crust and the mantle

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