8. Density currents move

from north to south

horizontally

from south to north

vertically

How are the high islands of the pacific formed? a. by connected coral reefs called atolls b. by lagoons c. by moving glaciers d. by underwater volcanoes

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

The district of columbia could be eliminated completely if a majority of congress voted in favor of the action. a. true b. false