Which gas forms 21% of Earth's atmosphere?

a.-argon

b.-carbon dioxide

c.-nitrogen

d.-oxygen

Explain the four stages of the water cycle

Which of the following is an effect of social reforms of the 19th and 20th centuries? A) Agricultural output decrease B) The population density in urban centers decreased C) The length of a normal work day increased D) The life expectancy for

Which of the following Pacific Island groups is the least populated? A. Melanesia B. Micronesia C. Polynesia D. Indonesia

Which of Earth's layers is comprised mainly of extremely hot liquid metals? A.) inner core B.) outer core C.) mantel D.) crust The answer is A!

What's the democracy score of South Africa 2019

Which of the following states is not part of the four corners? New Mexico, Utah, Colorado, Nevada Arizona?

What was the book called that was a collection of Confucian ideas?

What happens to the orbit of Earth when its velocity is halved? a. The orbit of Earth around the Sun becomes smaller c. The Earth escapes the Sun b. The orbit of Earth does not change d. The orbit becomes more elliptical

Which statements describe characteristics of deposition? Check all that apply. Several factors affect how sediment settles. Sediment is added to a new surface location. Moving water affects where sediment travels.

Which does the sun warm the most in one hour air soil or water?