What is the origin of all stars? a. supernova

b. dwarfs

c. protostars

d. nebulae

A cyclical motion occurs because of density differences in the mantle. Heated, less dense lower regions of the fluid mantle rise, and denser, cooler regions sink due to gravity. The combined motions serve as the engine for crustal plate movement. A.

Non-examples of a chemical reaction

Which term describes the transfer of thermal energy from one object to another because of a difference in temperature? 1. energy 2. friction 3. heat 4. work

the kinetic energy of a bowling ball is 25 (kg-m^2/sec^2). if the mass is 2 kg, the what is the speed of the bowling ball

4. You bought a block of cheddar from the grocery store. If you cut a small piece and a large piece from the same block of cheese, will they have the same density?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space