What is the weaker, hotter zone beneath the lithosphere that allows for motion of Earth's rigid outer shell? a. crust b. asthenosphere c. outer core d. inner core

What does the graph show about the U.S. economy overall?

Approximately how many earthquakes are strong enough to be felt each year worldwide? a.500 b. 1000 c. 10,000 d. 30,000

Igneous rocks of felsic composition have __________ and __________ relative to mafic igneous rocks.

Mineral hardness depends on chemical bond strength. From hardest to softest, rank the following minerals: (a) quartz, (b) diamond, (c) gold.

Fill in the blank with the term that best completes the following sentence. The color of a mineral in powdered form is the mineral’s ___________

Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral?

Describe the process that occurs when continents converge.

An atom has 8 protons, 8 neutrons, and 8 electrons. Another isotope of the same element might have?

Given that oxygen has an atomic number of 8. How many protons and neutrons are in the isotope $^{16}$O, or oxygen-16?

a) 8 protons and 7 neutrons

b) 16 protons and 0 neutrons

c) 8 protons and 8 neutrons

d) 16 protons and 16 neutrons

Silicate minerals are subdivided into ferromagnesian silicates and nonferromagnesian silicates. What two factors contribute to this subdivision?

The mineral class that makes up more than 95% of the continental crust is termed the ______.

Which of the following statements best describes a scientific law? A. It is an educated guess. B. It is a statement that describes what might happen some of the time. C. It is a statement that describes what scientists expect to happen all of the time under a specific set of conditions. D. It is a statement that describes all procedures that scientists must follow.

Can two igneous rocks have the same mineral composition?