Humans intervene in the nitrogen cycle in several ways. Which of the following is one of these?
A. Burning fossil fuels adds nitric oxide.
B. Agriculture decreases the production of nitrous oxides.
C. Protecting and replanting forests releases nitrogen.
D. Harvesting nitrogen-rich crops stores nitrogen in the topsoil.
E. Agriculture with fertilizers uses nitrogen in the aquatic systems.
Answer: A
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In which of the following cases will the total fertility rate (TFR) be highest?
A) when women marry early, have children, then die in their late 20s B) when women marry in their late 20s, then have several children C) when women marry in their late 30s, and then have children D) when women marry early and have one or two children E) when women marry early and have many children over a long span of years
Mass extinctions can be caused by different events, such as ____
A) ?extended absence of volcanic eruptions B) ?asteroids colliding with Earth C) ?steady climate conditions lasting millions of years D) ?stable atmospheric conditions that lead to competition of rare gases
What features are shown in this photograph?
A. pinnacles and sea stacks B. coral reefs C. sea caves D. karst topography E. None of these choices are correct.
Lakes are common in areas which have been recently ________
A) formed by volcanoes B) glaciated C) formed from river deposits D) raised above the sea E) hit by meteorites