About how long will a star with a mass about the same as our sun's mass

stay on the main sequence?

A) 5 million years

B) 10 billion years

C) 50 billion years

Which region produces about 70% of the worlds desalinated water?

Why was the precambrian era so long?

When a country has a large population, but very little arable land, what challenges might it experience?

The sedimentary rock that forms when fragments of other rocks have been wheathered and lithified are classified as

Which of the following is NOT native to Australia?. A. didgeridoos. B. boomerangs. C. koalas. D. sheep

Which European nation was the most influential in colonizing Brazil? A. Spain B. France Portugal D. England

What crops grow abundantly in the Central Valley of Chile? A) fruit, vegetables, and wine grapes B) sugar cane, rice, and oranges C) cacao, coffee, and bananas D) corn, wheat, and barley

Sections of active fault lines that haven't experienced a significant earthquake for a long time, even though adjacent sections have, are called a. stress accumulations. b. recurrence gaps. c. seismic risks. d. seismic gaps

What is the Trans-Siberian Railroad? a. the world's longest continuous railroad line b. the major link between Moscow and Europe c. the best way to travel between Russia and Afghanistan d. the shortest railroad in Siberia

What are the 4 different fields of study of Earth's systems?