recycling in nature

Question 1

atmosphere

Answer 1

the layers of gases surrounding the planet

Question 2

biosphere

Answer 2

all living things on Earth

Question 3

denitrifying bacteria

Answer 3

bacteria that convert nitrates back into gaseous nitrogen, which is then released back into the atmosphere

Question 4

fossil fuels

Answer 4

fuels that contain the carbon of plants and animals that dies and were preserved millions of years ago

Question 5

fossils

Answer 5

the preserved remains of once-living organisms

Question 6

hydrosphere

Answer 6

all the liquid water on the Earth’s surface

Question 7

leguminous plants

Answer 7

plants that can take nitrogen from the air and fix it in their tissues

Question 8

lithosphere

Answer 8

the land masses on Earth

Question 9

nitrogen cycle

Answer 9

the process by which nitrogen cycles between the living and non-living environments

Question 10

nitrogen-fixing bacteria

Answer 10

bacteria that absorb nitrogen from the air and convert it into ammonia and then into nitrates

Question 11

sustainable ecosystems

Answer 11

ecosystems that are diverse and provide for the needs of the organisms that live there