What extrusive igneous rock type cooled so quickly that visible crystal grains never grew, and the rock is composed entirely of black silicate glass that easily shatters into sharp, knife-like shards?

(A) Obsidian

(B) Pumice

(C) Scoria

(D) Tuff

The only Central American country with a long history of democratic government isA. Guatemala. B. Costa Rica. C. Nicaragua. D. Belize.

Economic activity along the Great Lakes

Planetary orbits are highly inclined to the ecliptic. have the Sun at their exact center. are evenly spaced throughout the solar system. are spaced more closely together as they get further from the Sun. are almost circular, with low eccentricities.

It is 11 a. m. in the Eastern Time Zone; therefore, it is 8 a. m. 12 p. m. 9 a. m. in the Pacific Time Zone. It is 11 a. m. in the Eastern Time Zone; therefore, it is 8 a. m. or 12 p. m. or 9 a. m. in the Pacific Time Zone? A. It is 3 p. m.

The atmosphere: A. becomes less dense with increasing altitude B. becomes less dense throughout the troposphere and then more dense in the stratosphere C. becomes more dense with increasing altitude D.

The greek city states

How is the windward slope of a mountain range similar to the equatorial low-pressure zone?

13. The subatomic particle that contributes mass and a single positive charge to an atom is the a. proton b. neutron c. electron

Which bodies of water of water border canada? choose all that are correct artic ocean atlantic ocean pacific ocean indian ocean

The cell theory was developed as a result of what