Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of to make and oxygen. Both plants and animals use oxygen in the biological process of and make CO2. The is the main regulator of CO2 in the atmosphere, because it covers most of the Earth, and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other organisms. Today these carbon rich deposits are burned as fossil fuels, which include , , and . More CO2 is released in the atmosphere today than in the past because of the . But is a greenhouse gas, as is water, and methane, and too much CO2 and other greenhouse gases produced by human activities in the atmosphere may be responsible for human accelerated .

Question

Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of to make and oxygen. Both plants and animals use oxygen in the biological process of and make CO2. The is the main regulator of CO2 in the atmosphere, because it covers most of the Earth, and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other organisms. Today these carbon rich deposits are burned as fossil fuels, which include , , and . More CO2 is released in the atmosphere today than in the past because of the . But is a greenhouse gas, as is water, and methane, and too much CO2 and other greenhouse gases produced by human activities in the atmosphere may be responsible for human accelerated .

Word Bank:
burning of fossil fuels
coal
respiration
carbon dioxide
glucose
oil
green house effect
fermentation
decayed
ozone
soil
erosion
natural gas
climate change
carbon monoxide
natural gas
decomposition
coal
natural gas
ocean
oxygen
coal
methane
photosynthesis
oil
oil

Fill in the blank

Answer 1

Plants and other photoautotrophs use CO2 (carbon dioxide) in the process of photosynthesis to make glucose and oxygen. Both plants and animals use oxygen in the biological process of respiration and make CO2. The ocean is the main regulator of CO2 in the atmosphere, because it covers most of the Earth, and CO2 dissolves easily in it. Millions of years ago, huge deposits of carbon were stored, which were formed from dead plants and other decayed organisms. Today these carbon-rich deposits are burned as fossil fuels, which include coal, oil, and natural gas. More CO2 is released in the atmosphere today than in the past because of the burning of fossil fuels. But CO2 is a greenhouse gas, as is water, and methane, and too much CO2 and other greenhouse gases produced by human activities in the atmosphere may be responsible for human accelerated climate change.