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

What country on the map is actually made up of small islands?

A dating system that describes only the order in which rocks were formed is called

All major american cities during the first 50 years of independence were located

Sometimes volcanoes erupt and expel hot ash, gases and rocks through a: A) lava river. B) pyroclastic flow. C) ash cloud. D) rock slide.

Which of the following activities can you do at salitre magico in bogota a. watch films b. buy souvenirs c. go on amusement park rides d. listen to cumbia Which of the following countries borders Columbia a. Panama b. Venezuela c. Ecuador d. Chile

Ice hotel facts? in sweden

Compared with the land in the highlands, the lowlands region of England is___. A) Rockier and more difficult for farming B) The center of business and industry C) Richer in coal reserves D) Covered by more fertile farmland Answer: D) Covered by more

What are the three main types of erosion caused by glaciers?

How do we know that africa was the birthplace of the earlist humans

What would happen if the wernicke's area is damaged?