Science 5.2

Question 1

bacteria and plants

Answer 1

necessary organisms in nitrogen cycle

Question 2

denitrification

Answer 2

release of nitrogen from nitrogen compounds

Question 3

artificial fertilizer

Answer 3

may upset nitrogen cycle

Question 4

greenhouse effect

Answer 4

carbon dioxide and water vapor trapping heat

Question 5

nitrogen fixation

Answer 5

Changing nitrogen to nitrogen compounds

Question 6

ozonosphere

Answer 6

screens out ultraviolet rays

Question 7

respiration

Answer 7

process of obtaining energy from food

Question 8

temperature

Answer 8

main difference in layers of atmosphere

Question 9

troposphere

Answer 9

the sphere of overturning

Question 10

water droplets

Answer 10

forms as water vapor condenses

Question 11

Unnecessary part of the nitrogen cycle

Answer 11

animals

Question 12

Nitrogen makes up _________ percent of the atmosphere.

Answer 12

78

Question 13

Carbon dioxide is exchanged between the atmosphere and __________.

Answer 13

the oceans

Question 14

the two basic processes of life involve in the carbon-oxygen cycle are _________

Answer 14

respiration and photosynthesis

Question 15

Carbon stored in animals is returned to the atmosphere when they __________

Answer 15

decompose

Question 16

oxygen makes up __________ percent of the atmosphere

Answer 16

21

Question 17

humans return carbon stored in fossils to the carbon- oxygen cycle by burning __________.

Answer 17

coal and oil

Question 18

the process of changing a gas to a liquid is known as ___________

Answer 18

condensation

Question 19

oceans store more carbon dioxide than is stored in the _________

Answer 19

atmosphere

Question 20

water is kept from completing the water cycle by being stored _____________

Answer 20

in ice

Question 21

the process of changing liquid to a gas is called ________________

Answer 21

evaporation

Question 22

Heat is necessary for water to _____________

Answer 22

evaporate

Question 23

Rain or snow falling to the ground is called ___________

Answer 23

precipitation

Question 24

water vapor that condenses on particles of dust forms ______

Answer 24

droplets

Question 25

for the entire Earth, the amount of evaporation must equal the amount of _____________

Answer 25

precipitation

Question 26

True or false
an increase in the amount of carbon dioxide in our atmosphere will cause a warming trend.

Answer 26

true

Question 27

True or false
transpiration is evaporation from plants

Answer 27

true

Question 28

True or false
Carbon dioxide easily dissolves in ocean water

Answer 28

true

Question 29

True or false
ideally, the rate at which plants produce oxygen is equal to the rate at which living things use oxygen

Answer 29

true

Question 30

photosynthesis is a step in the carbon-oxygen cycle in which __________ are exchanged into foods containing carbon.

Answer 30

carbon dioxide and energy

Question 31

respiration is a step in the carbon-oxygen cycle in which foods containing carbon are changed into __________

Answer 31

energy and carbon dioxide

Question 32

A step in the nitrogen cycle which is unfavorable to farming is __________

Answer 32

denitrification

Question 33

plants that have bacteria in root nodules are called ____________

Answer 33

Legumes

Question 34

animals must eat __________________ to obtain protein.