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Flashcards in Soil Deck (16)
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Soil is a mixture of five materials:

Weathered rock
Water
Air
Minerals
Humus

1

The kind of soil in an area depends on:

-the kind of rock
-the area's climate
-the landforms
-the plants
-the animals/organisms
-time

2

Soil horizon

A layer of soil with properties that differ from those of the layer above or below it.

3

O horizon

Accumulation of twigs, leaves, and decomposing plants

4

A horizon

Top soil later that contains humus mixed with mineral particles and has darkest color

5

B horizon

Has very little material and contains clay and minerals washed down from A horizon. It has a brownish reddish color.

6

C horizon

Deepest layer of soil that contains the largest and least weathered rock particles. It is light yellowish brownish in color

7

R horizon

Layer of bedrock

8

Texture

Determined by the size of the weathered rock particles it contains

9

Fertility

The ability of a soil to provide plant nuetrients

10

Pore space

Amount of space between the soil particles

11

Chemistry

pH level of the water in the soil (how much acid is in the water).

12

Water retention

The soil's ability to hold water/moisture.

13

5 properties of soil:

Texture, fertility, pore space, chemistry, water retention

14

4 types of mechanical weathering:

Pressure release, plant root growth, ice wedging, and abrasion

15

2 types of chemical weathering:

Dissolving and rusting