1. The thermal convection that drives plate motion is caused by

O gravitational motions

O subduction

O sea-floor spreading

O an unequal distribution of heat

Which of Newton's laws of motion explains WHY a book can just sit motionless on a shelf? A. first B. second C. third

Which scenario represents the weakest force? (Assume particles in all scenarios are the same distance apart.) Protons and neutrons are held together inside the nucleus. Two particles are attracted to one another by static electricity.

If a substance can be separated by physical means and it is not the same through, what is it? A) element B) compound C) homogeneous solution D) heterogeneous solution

Highway safety engineers build soft barriers so that cars hitting them will slow down at a safe rate. a person wearing a safety belt can withstand an acceleration of 300 m/s 2.

A wave has a velocity of 24 m/s and a period of 3.0 s. Calculate the wavelength of the wave

What property of sound enables us to distinguish one sound source from another?

The table below shows the right ascensions of two stars at a location. Star 1 - 4 right ascension (in Hour) Star 2 - 3 right ascension (in Hour) Which of these statements is correct about the stars?

H-2 + H-3 → He-4 + Consider the nuclear reaction that takes place in the sun. Two nuclides of hydrogen fuse to form helium. Is helium the only product of this reaction? If no, identify any additional products. A) Yes, He-4 is the only product. B) No.

Hat is a scientific theory? Make up your own scientific theory.

Which of the following is an example of a velocity? O A. 12 m/s O B. 45 km/hr south O C. 55 km/hr D. - 5 m/s2 east