Rain, sleet, or snow that contains a high concentration of acids:

The breakdown of rock into smaller pieces by physical means:

A chemical reaction in which an element, such as iron, combines with oxygen to form an oxide:

Which is a type of frost action?

Weathering occurs faster at high elevations because of:

Differential weathering is compared to what:

The soil that is blown or washed away from its parent rock is

The layer of rock beneath the soil

The rock formation that is the source of mineral fragments in the soil.

Soil that remains above its parent rock

Soil quality that is based on the proportions of soil particles:

Soil's ability to hold nutrients and to supply nutrients to a plant:

Ability of water to move through the soil:

The organic material formed in soil from the decayed remains of plants and animal is called____.

Because of the way soil forms, soil often ends up in a series of horizontal layers called ___.

The top layer of soil, often called, ___, usually contains more humus than the layers below it.

The removal of substances that can be dissolved from rocks and soil due to water passing through is called ___.

Maintaining the fertility of soil by preventing erosion and nutrient loss is called ___.

Without plants to help hold and cycle water, an infertile area can become like a desert, a process called ___.

Crops that are planted between harvests to replace certain nutrients and prevent erosion are called ___.

The practice of planting different crops each year to slow down nutrient depletion is called ___.