What causes sedimentary rock to change into metamorphic rock? A) cooling B) melting C) heat and pressure D) weathering and erosion

Choose the answer that explains the photoelectric effect.

What machine actually reduces the amount of force exerted because it acts over a greater distance? a shovel a bottle opener a garden rake a hammer

A book rests on a table, exerting a downward force on the table. the reaction to this force is:

Calculate potential energy of a 5 kg object sitting on 3 meter ledge

Explain the role convection currents plays in creating currents in the ocean

Which of the following is not true of the seasons? A. The Earth is closer to the sun during the summer and farther away from the sun during the winter. B. The seasons are caused the tilt of the Earth on its axis. C.

The presently accepted value of the hubble constant gives an age of

why do you think people had a hard time accepting the idea of gravity as a force that keeps planets in their orbits?

If a hot-air balloon hovers at a fixed altitude the net weight of the balloon must be

For an object to appear blue what must the object do to blue light waves? A. It must refract them B. It must diffract them C. it must reflect them D. It must shift them