Human Impact
True or false: deforestation can cause an increase in CO2 levels in the atmosphere.
True.
True or false: trees can hold carbon in their branches and trunks.
True.
What layer of the atmosphere is the closest to the surface of the Earth?
The troposphere.
True or false: Having higher concentrations of carbon in soil, increases the productivity, fertility, and the physical stability of the soil.
True.
Fill in blank #1
Photosynthesis
Where do fossil fuels originally come from?
Decayed plants and animals(detritus).
How does carbon enter into soil to be sequestered?
Through tree roots or decaying matter(detritus).
What is the ideal concentration of CO2 in the atmosphere?
a) 470ppm
b) 420ppm
c) 350ppm
350ppm
What are the two largest carbon sinks?
The ocean and soil.
Fill in blank #2
Cellular Respiration
True or false: The concentration of CO2 in the atmosphere has increased significantly since the 1800s.
True.
If CO2 levels in the atmosphere decrease, will the Earth's temperature increase or decrease?
Decrease.
What two natural processes affect the concentration of carbon in the atmosphere the most?
Cellular respiration and Photosynthesis.
In an iceage, are CO2 concentrations in the atmosphere high or low?
Low.
Answer question #3
Release
What human activity releases the most CO2 into the atmosphere?
a) Agriculture
b) Cellular Respiration
c) Burning Fossil Fuels
Burning fossil fuels.
On average, is the rate of photosynthesis(absorbing CO2) or cellular respiration(releasing CO2) faster?
Photosynthesis.
What is the current concentration of CO2 in the atmosphere?
a) 501ppm
b) 410ppm
c) 320ppm
410ppm
What are the four organic compounds that carbon is found in?
Carbohydrates, lipids, nucleic acid, and proteins.
Answer question #4
Humans emit ___ times as much carbon into the atmosphere than volcanoes.
a) 50-100
b) 25-40
c) 200-250
50 - 100 times as much carbon.
How much CO2 do erupting volcanoes release into the atmosphere each year?
a) 100 - 400 metric tons
b) 5,000 - 6,000 metric tons
c) 10,000 - 10,500 metric tons
100 - 400 metric tons
Carbon accounts for what percentage of the troposphere?
a) 93.1%
b) 10.01%
c) 0.04%
0.04%
The amount of this isotope of carbon has increased in the atmosphere due to the burning of fossil fuels.
a) Carbon 12
b) Carbon 17
c) Carbon 22
Carbon 12
Answer question #5
Increases