Carbon dioxide and water vapor are variable gases because

a. heir amounts vary throughout the atmosphere.
b. they only make up 1% of the atmosphere
c. sometimes they're in the atmosphere, sometimes they're not
d. one gas depends on the other gas

A. their amounts vary throughout the atmosphere

Explanation:

Atmosphere consists of number of gases and composition of atmosphere varies depending on the amount of gases present in the atmosphere. The percentage of carbon dioxide in atmosphere is 0.04% while that of water vapors is 4% at normal room temperature.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

all answers true and false

explanation: