Soils vary throughout the world. Climate, elevation, plant growth; these are just some factors that influence weathering and soil formation. The tundra and the desert are alike in some ways; different in others. Both the tundra and the dessert have little available water for plant growth.

Imagine you are collecting soil samples from a desert location and the tundra. What might these soil samples have in common?

A) a very low amount of humus
B) lots of decomposing tree roots
C) very small, fine-textured soil particles
D) a large amount of sand and very little silt or clay