Air bubbles that are trapped in ice sheets and the surrounding water can be used to determine Which of the following are natural sources of atmospheric methane? 15

1. Air bubbles that are trapped in ice sheets and the surrounding water can be used to determine

Atmosphere composition, Atmosphere temperature at the rime the air was captured

2. Which of the following are natural sources of atmospheric methane?

wetlands, termites, and hydrates

3. 15. Which of the following are anthropogenic sources of atmospheric CO2?

combustion of fossil fuels and deforestation

4. Ice cover reflects sunlight and water absorbs it. How the melting of ice sheets affects temperature is an example of a _

positive feedback loop

5. During glacial periods, climate is dry and continental margins are exposed, leading to more atmospheric dust. Dust carries the micronutrient __________ which enables photosynthetic phytoplankton to draw down atmospheric CO2.

Fe

6. Global sea level is controlled by all of the following factors except _______.

emergence/subsidence of land particular to your location

7. 8. Which of the following is true of alpha decay?

a chunk (2 neutrons and 2 protons) of the radionuclei breaks off
is nonpenetrating (stopped by clothing)

8. Isotopes are atoms that have different numbers of ____________ in their nucleus but the same number of ____________.

neutrons; protons

9. 12. Which of the following is an example of empirical science?

taking a biological census of species diversity in an area

10. Environmental literacy involves which of the following?

gaining the ability to understand environmental problems