What type of boundary occurs where two plates move together causing one plae to descend in the mantle beneath the other plate

What causes convection in the lower mantle to occur? (be able to discuss temperature and density)

Unlike mechanical waves, electromagnetic waves do not require to travel through.

Voltage can exist without A. current. B. resistance. C. a closed circuit. D. all of these

In optics, how do you get the refractive index

Mitosis is the process by which cells grow the process by which cells make new cells the process by which cells combine to form tissues the process by which cells are recycled

A wave has a wavelength of 50 m and a speed of 200 m/s. What is the frequency of this wave in hertz?

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

Which of the following best describes the earth's average surface temperature for the past 900,000 years? A. a steady warming trend B. fairly steady temperatures until recently C. prolonged periods of cooling and warming D.

A capacitor with initial charge q0 is discharged through a resistor. What multiple of the time constant τ gives the time the capacitor takes to lose (a) the first 1/8-th of its charge (b) 7/8-th of its charge?

A sheet of paper has a mass of 5 grams. The paper is dropped from a high building twice (it reaches terminal speed in both cases), once as a flat paper of area 600 cm2 and once crumpled as a ball of radius 2 cm.