the hardness of a unknown mineral can be found by

A) subjecting it to a strength test

B) calculating its density

C) comparing it to the other known samples using a scratch test

D) grinding it on a streak plate

How do we have proof that Pangea existed?

The what serves as a border between north united state and canada

The tallest mountain in central asia is located in turkmenistan? True or faulse

What is the main purpose of this excerpt from a speech? Every year, 15 million Americans are the victims of computer hackers who steal their personal information. And this number is growing every year.

The largest canyons and deepest valleys were created by a. moving water. c. wind erosion. b. chemical weathering. d. plate tectonics.

How high does the earth's atmosphere extend? A. 100 m B. 1,000 m C. 10 km D. 100km

How to grow plants in space?

Based on this map of oil imports, which nation imported the greatest number of oil barrels each day in the years before 2006? A. China B. Australia C. Canada D. the United States

How far will a P-wave travel in 9 min 20 sec?

The land in Mexico City is sinking. What is the primary cause of this problem? A. deforestation caused by cutting down trees B. too much water being taken from underground aquifers C. too many offices and towers being built in the city D.