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WorksheetsEnvironmental Science Final Reveiw
Total questions: 10
Worksheet time: 7mins
Use the table to answer the following question: a sample is tested and found to contain a C-14/N-14 ratio of 80% C-14 and 20% N-14. How old is the sample?
2,000 years
4,000 years
10,000 years
20,000 years
What piece of information from this chart would you need to use to determine the age of a sample by Carbon dating?
30% C-14
30% N-14
70% C-14
70% N-14
C-14 has a half life of 5,730 years. If a sample of fossilized wood is tested for the ratio of C-14 to N-14 and found to contain 25% C-14 and 75% N-14. How old is the sample?
Hint: How many times do you need to cut something in half to have 25%?
5,730 years
11,460 years
15,000 years
17,190 years
What is the prime mover of surface currents?
Earthquakes
Heat from the sun
Inflow from rivers
wind
What causes surface currents to sink?
Decrease in temperature and decrease in salinity leading to increased density.
Decrease in temperature and increase in salinity leading to increased density.
Increase in temperature and decrease in salinity leading to increased density.
increase in temperature and increase in salinity leading to increased density.
Which of these factors increase ocean salinity?
Evaporation
Ice melting
Inflow from freshwater rivers
weathering of rocks
What is the primary cause of increasing ocean acidification?
Increasing ocean carbon levels
Ocean warming
Increasing ocean salinity
Pollution
What is a climate proxy?
A record of past climate.
A substitute for climate
A predictor of future climate.
A preserved physical characteristic.
A varve is collected and the thickness of each layer is measured and graphed. It can be seen that over time the thickness of the varve layers increase. What does this indicate?
Climate cooling in the area.
Climate warming in the area.
Global cooling.
Global warming.
What is the nitrogen cycle
A vehicle powered by nitrogen gas.
An event in which nitrogen moves from the soil to the atmosphere.
The cycle of events that puts Nitrous Oxide into the atmosphere.
The movement of nitrogen through the different environmental spheres.
