Marine snow refers to
a. appearance of the water during freezing weather
b. animal and plant plankton that die and drift downward
c. white sand beaches
d. algal blooms
e. weather over the Arctic that contributes to the ice pack
B
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Which of the following is an example of a common ecosystem service?
A. Earthworm eat leaves and defecate deep in their burrows. B. Decomposer bacteria and other organisms cause leaves to decompose on the forest floor. C. People enjoy seeing wildlife. D. All of the statements are correct. E. None of the statements are correct.
Dew PointFor the following questions refer to the temperature and dew point data in the following cities: CityAir Temperature (ºC)Dew Point (ºC)City A3524City B-12-12City C-1-6City D106A humidex reading over which of the following values is considered dangerous?
A. 30 B. 40 C. 46 D. 54
How has the composition of Earth’s atmosphere changed over time? Briefly outline the evolution of Earth’s atmosphere
What will be an ideal response?
The presence of coliform bacteria in a source of drinking water indicates
A. that it has been contaminated with human or animal waste. B. that it has a high biochemical oxygen demand. C. that it contains toxic materials. D. All of these are correct statements.