Which characteristic of tsunamis is true? They are measured by how far they travel.

They cause the ocean to briefly drain away from the shore.

They can travel as fast as 500 miles per day.

They occur a day or two after an earthquake.

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

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

The earth rotates on its axis and revolves around the sun every