Which of the following best describes topsoil? a. topsoil is made entirely of decomposed organic remains. b. topsoil is made of humus and clay minerals washed down from the layer above the topsoil. c. topsoil is made of humus and mineral particles weathered from the soil's parent material. d. topsoil is made entirely of minerals weathered from the underlying parent material.

The answer is C.

Topsoil is made of humus and mineral particles weathered from the soil's parent material.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.