_________ percent of the Earth’s surface is covered by sedimentary rocks. 

Currently, there are more Texans over the age of 65 than there are Texans under the age of 18.

The Texas Constitution has many more amendments than the U.S. Constitution.

Rocks are constantly changing due to the _____________. 

Earthquakes are recorded on a __________. 

Where does Texas rank among state in population?

The ratio of the mass of a substance to its volume. 

Interaction that will result in a subsequent characteristic x-ray emission to fill inner shell vacancy

Bremsstrahlung x-rays are produced by ____ at the target.

In general, American immigrants who moved to Texas during the 1820s and 1830s ignored Mexican laws regarding religion and slavery.