How do slab pull forces affect plate motion? Choose the correct answer. Uplifted mantle causes plates to move apart.

Convection currents drive the plate downward to move it.

Earthquakes break the crust into smaller plates to make motion easier.

The weight of the subducted plate produces a force to continue moving the plate.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.