If a substance has a half-life of 10 million years, what fraction of the atoms

remain after 20 million years?

Earth rotates on its axis, a large rotating globe could spin in many directions, but earth is held steady by a. two magnetic poles. b. the sun's gravitational pull. c. the moon's gravitational pull. d. the equator.

Why are the N, S, E, and W designations often omitted from coordinates on U. S. topographic maps?

When did Fidel Castro take power, and what immediate actions did he take to upset relations between Cuba and the United States

The following are all examples of the tragedy of the commons, except: Select the correct answer below: A) pollution from various industries damaging the atmosphere B) groundwater becoming contaminated C) destructive logging practices D) solar panel

What is 2/3, - 4/3, 1/3, 1/2 from least to greatest

The political boundaries of North Africa and the Middle East can best be described as the product of which of the following processes? a. Devolutionb. Imperialismc. Self-determinationd. Democratisatione. Supranationalism

What happens when two oceanic plates collide? What negative impacts for human populations can result from this type of action?

A manufacturers producing 950 light bulb per day

Most of the current landscape features of the beautiful Alps region owe their origins to:

Consider the debate in East Africa over land between nature parks and farmers. Who do you think should get more of the land in these rural areas? Explain.