For which planets is it possible for the sun to remain overhead for years at a time at either pole and for the equator to receive almost no sunlight for years?

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory

What processes does carbon cycle through the biosphere?