The spectrum of a distant star contains sodium lines that are offset from their normal position, as shown. What is the most likely explanation? A. The star is relatively hot.
B. The star is relatively cool.
C. The star is moving rapidly toward us.
D. The star is moving rapidly away from us.

Science describe how heat moves in a convection current. how is this process responsible for moving earth’s tectonic plates? discuss two ways that humans are impacting our earth. be sure to pick one way we are impacting our land, and one way we are impacting our water. then, create an action plan that includes a way that you and your family can protect the earth from these impacts