How does the temperature of the earth’s mantle compare to the other layers of the earth?
a) the mantle is hotter than the core.
eliminate
b) the mantle is hotter than the crust.
c) the mantle is the same temperature as the core.
d) the mantle is the same temperature as the crust.

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.