Human Impact Part 2

Resources than can regenerate if they are alive or can be replenished by biochemical cycles if they are nonliving

• non-renewable resources

• renewable resources

Resources that cannot be replenished by natural processes.

• non-renewable resources

• renewable resources

The process of using natural resources without depleting them.

• renewable resource

• sustainable development

• deforestation

What makes the soil fertile and is found in the uppermost layer of soil?

• sand

• clay

• humus

Fertile topsoil is held in place by ...

• deep roots of plants

• sand

• wind

The wearing away of the surface of the soil by water and wind is called __________________.

• non-renewable resource

• humus

• soil erosion

Humans impact the soil by __________ which removes the roots that hold the soil in place.

• grazing

• humus

• plowing

In certain parts of the world with dry climates, a combination of farming, overgrazing and drought has turned productive areas into deserts. This process is called ________________.

• sustainable development

• desertification

• soil erosion

Temperate forests of the US have been cut down and have already grown back. This means that they are ___________________ resources

• renewable

• non-renewable

Old growth forests have never been cut. If this type of forest is cut it could take centuries before it is replaced. They are essentially ____________________ resources.

• renewable

• non-renewable