Which mountains is located in the united states?

Computer models can scientists predict weather. some computer models can show the predicted path of hurricanes. what other events could a computer model warn us of? a) undersea earthquakes , tornadoes, and avalanches b) tornadoes c) avalanches d) undersea earthquakes

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

If scientists only detect p waves in a certain layer of earths interior what does that tell us?