What causes clouds of dust and gas to form a protostar?
(1) magnetism (3) expansion of matter
(2) gravitational attraction (4) cosmic background radiation

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

How did the lab activities you answer the lesson question: what effect does plate movement have on geologic events and structures at earth’s surface? what did you learn from conducting this lab?

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it