Exit Which of the following is NOT a source of Earth's internal heat?

a. mantle convection

b. radioactive substances

c. gravitational contraction

d. past bombardment by asteroids

What layer of the atmosphere does radio waves travel best in which layer of the atmosphere

What language is the most widely spoken in the Caribbean, Central America, and South America? American French Portuguese Spanish

15. What is the solar altitude on the 4th of July in Washington, D. C., at latitude 39"N? a. 22.7 b. 73.7 c. 23.5 d. 51° e. 90° 16. Through the whole year, the sun's declination migrates through a total of a. 23.5° b. 30° с. 470 d. 66.5° e. 133

Deltas a. are made of sediment deposited near the mouth of a stream. b. form where a stream deposits sediment on a flat plain at the base of a mountain range. c. contain distributaries that flow into the trunk river. d.

A direct democracy is a form of government in which citizens a. vote on all laws and important decisions. b. elect representatives to make decisions. c. choose a strong leader to write laws. d. are led by a council of five hundred members.

Which of the following is not part of the definition of a mineral? A) Naturally occurring B) Organic C) Orderly crystalline structure D) Definite chemical composition

Como é formado o relevo africano?

What would you do if climate hazards were hit your local area with flooding of a local river because of a thunderstorm?

What event increased international support for the creation of a Jewish national homeland in Palestine? A. the Arab-Israeli War B. the signing of the Balfour Declaration C. the Holocaust D. the British withdrawal from Palestine

Which resources are found in Brazil's rain forests? Choose all answers that are correct. rubber nuts medicinal plants wheat