Two locations include a layer of rock with a particular index fossil. In one location, the layer occurs in a higher position than in the other. What can you conclude about the history of the two areas?

How does the parallax of a nearby object compare to that of an object farther away?

Distance that the transcontinental railroad covered from omaha to san francisco.

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire