3. Which material forms in sediments and is a precursor to hydrocarbons?

O A. Kerogen

O B. Nitrates

O C. Methane

O D. Cyanobacteria

Which of the following statements about metamorphic rocks and their characteristic environments is true? Choose one: A. Blueschists are found in the mid-ocean ridge. B. Gneiss is found in metamorphic aureoles surrounding plutons. C.

Is Russia a communist country

Which of the following animals indicated in the Antarctica Food Web folder is a source of food for the greatest number of other animals in this food web? A. Fish B. Phytoplankton C. Killer D. Whales E. Krill Squid

Which of the following planets is a terrestrial planet? A. Neptune B. Jupiter C. Mars D. Saturn

What was the result of the Korean War? a. a communist North Korea and a noncommunist South Korea b. a democratic North Korea and a communist South Korea c. a unified Korea under Soviet influence d. a unified Korea under Western influence

Why are oxygen concentrations in the deep waters of the North Atlantic higher than the concentrations found in the deep North Pacific?

By what year will 2/3 of the world's population lack access to clean drinking water?

How Dawlish Warren is formed

What are two factors that influence the gravitational pull of an object?

Which resources are important to the economies of many countries in Siberian Russia, Central Asia, and the Caucasus region? A. oil B. timber C. diamonds D. coal