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

Describe a way that trade barriers can affect you as a consumer

Why does earth not continually get larger and larger

Which of the following would reduce wind erosion? limiting irrigation cutting down trees planting vegetation clearing away dead leaves

Lines of longitude are like stripes from the top of the globe down to the bottom virtually slicing the earth like an orange

Two plates of equal density form mountain ranges along what?

What types of areas are created by sinking, dry air at 30 degrees north or south latitude?

The us congress passage of the Homestead act in 1862 can be considered a pull factor that caused people to migrate to the us

Name the river that forms a border between the states of washington and oregon

Match the city in column 1 to its description in column 2. A. Shenzhen B. Tianjin C. Nanjing D. Guangzhou Located near Beijing; has agriculture and manufacturing. Former capital of China with rich history and culture; large manufacturing center.

Mengapakah delta terbentuk di muara sungai