Unit 13

Front 1

leaf litter

Back 1

material forming a surface-covering layer, in particular.

Front 2

Dust Bowl

Back 2

an area of land where vegetation has been lost and soil reduced to dust and eroded, especially as a consequence of drought or unsuitable farming practice.

Front 3

Soil erosion

Back 3

Soil erosion is defined as the wearing away of topsoil. Topsoil is the top layer of soil and is the most fertile because it contains the most organic, nutrient-rich materials. One of the main causes of soil erosion is water erosion, which is the loss of topsoil due to water.

Front 4

farming

Back 4

the activity or business of growing crops and raising livestock.

Front 5

agriculture

Back 5

the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.

Front 6

grazing

Back 6

grassland suitable for pasturage.

Front 7

logging

Back 7

the activity or business of felling trees and cutting and preparing the timber.

Front 8

mining

Back 8

the process or industry of obtaining coal or other minerals from a mine.

Front 9

construction

Back 9

the style or method used in the building of something.

Front 10

Recreational activities

Back 10

Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or pleasure and are considered to be "fun".

Front 11

Superfund act

Back 11

Superfund is a United States federal government program designed to fund the cleanup of sites contaminated with hazardous substances and pollutants. It was established as the Comprehensive Environmental Response, Compensation, and LiabilityAct of 1980 (CERCLA)

Front 12

Superfun site

Back 12

.A Superfund site is any land in the United States that has been contaminated by hazardous waste and identified by the EPA as a candidate for cleanup because it poses a risk to human health and/or the environment. These sites are placed on the National Priorities List (NPL).

Front 13

Hazardous waste

Back 13

Hazardous waste is waste that poses substantial or potential threats to public health or the environment. In the United States, the treatment, storage, and disposal ofhazardous waste are regulated under the Resource Conservation and Recovery Act (RCRA).

Front 14

Toxic

Back 14

toxic waste definition. A general term used to refer to chemical compounds produced by industry which, if they are ingested or breathed in by humans, can cause physiological damage. The disposal of toxic wastes is a major environmental problem in the United States.

Front 15

Chemically active

Back 15

An element's chemical activity is defined as its stability relative to the elements surrounding it on the periodic table. Chemical activity is also related to electronegativity. Elements that are highly electronegative are highly reactive, while elements that have low electronegativity are less reactive.

Front 16

Corrosive

Back 16

tending to cause corrosion.

Front 17

Flammable

Back 17

fire prone

Front 18

Pesticides

Back 18

a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.

Front 19

Medical wastes

Back 19

Medical waste is defined as: potentially infectious waste materials generated at health care facilities, such as hospitals, clinics, physician's offices, dental practices, blood banks, and veterinary hospitals/clinics, as well as medical research facilities and laboratories.