What is the thick, old crust of Earth known as?

How are the locations of earthquakes, mountain ranges, and volcanic activity related

Is anything being done to eliminate the burning tropical forests?

People expect higher standards of living and the latest devices gobble up energy. We still use a lot of fossil fuels, like oil coal and gas.

Why is the length of a sidereal day and a solar day on earth so similar?

Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock? (1) 0.3 10^9 y (3) 2.6 10^9 y (2) 1.3 10^9 y (4) 3.9 10^9 y

A. Tundra B. Rain Forest C. Savannah D. Desert 1. Many Trees 2. Fewest Plants 3. No Trees, Grasses 4. Grasses and Trees Match Them Up

Which totally revolutionized industry by increasing efficiency?

Analyze the map below and answer the question that follows. Based on the map above, which of the following continents are the most developed? Note, the darker the shade of green, the more developed the region is. A. Africa and Australia B.

Give any two major agricultural products that are exported in majority and that are part of south africa's stable diet

Some of the results of Soviet control on Eastern Europe included