The Geologic Time Scale is divided into huge blocks of time called eras. Eras are defined by major changes in the fossils found in the rock layers that were formed during those time spans.

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.

What characteristic of the basin that feeds the congo river system affects movement in central africa? a. the center of the basin is a dense rain forest. b. it is the center of ethnic conflict in the area. c. wildlife on the savanna makes it too dangerous to travel. d. the basin is surrounded by desert.

The sun rises in the west and sets in the east on 2 planets; which 2 planets are they