Astar that's actively fusing hydrogen into helium is aa. supergiant.
b. main-sequence star.
c. red giant.
d. white dwarf.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

The place where two plates come together is known as a a. transform boundary. b. divergent boundary. c. convergent boundary. d. rift valley.

The height of the empire state building is 318 m if a stone is dropped from the top of the building what is the stones velocity just before it strikes the ground