Term
|
Definition
| deepest layer of soil, makes up the Earth's crust |
|
|
Term
|
Definition
|
|
Term
|
Definition
very top layer of dead leaves and grass |
|
|
Term
|
Definition
| mixture of rock fragments, nutrients, water, air and decaying animal and plant matter |
|
|
Term
|
Definition
-located below the topsoil
-also contains rock fragments, water and air, but has less animal and plant matter |
|
|
Term
|
Definition
| process by which wind, water or ice moves particles of rocks or soil |
|
|
Term
|
Definition
-crops use more nutrients than the decomposers can supply
-the soil becomes less fertile |
|
|
Term
|
Definition
| includes nutrients that help crops grow better |
|
|
Term
|
Definition
| advance of desert-like conditions into areas that previously were fertile |
|
|
Term
|
Definition
-period when less rain than normal falls in an area
-crops suffer |
|
|
Term
|
Definition
| process of restoring an area of land to a more natural, productive state |
|
|
