4. The center of the earth is called the...

a) crust.
b) mandle.
c) core.
d) lithosphere

The large connected urbane area from boston to washington, d.c. is often referred to as

Why is immigration so important today?

What is likely to happen in the long term if the earth continues to absorb more energy than it emits? a. the earth will discontinue recycling energy. b. organisms will begin to compensate for the change by incorporating more energy. c. the overall temperature of the earth will increase. d. the nutrient cycles will happen more frequently. select the best answer from the choices provided a b c d