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 issue sub-saharan africa is currently facing, or will face in the near future.?

What are similarities between mountains and plains?

With a gas station on almost every corner, it's hard to imagine life without fossil fuels. Fossil fuels power everything from homes to businesses to cars. But fossil fuels are nonrenewable resources and have negative effects on the environment.

What was the ain cause of the cold war

Which area is NOT considered part of the British Isles?

A geographer that focuses on human systems will focus on the study of

In what ways might technological advances benefit Sub-Saharan Africa?

Explain two human developments that would increase the risk of being affected by natural hazards

Greater education for women tends to decrease the birthrate because it enables women to develop a more egalitarian role within society. recognize the importance of having financial independence.

Who wrote the hieroglyphics and bound them into books for the mayan?