When two tectonic plates collide A) they both stop moving. B) ...

[Kthamas]

When two tectonic plates collide
 
  A) they both stop moving.
  B) they always produce high mountain chains like the Himalayas.
  C) volcanoes always mark the boundary between them.
  D) they continue moving, producing a variety of large deformations.
  E) that region is safe from earthquakes now the plates are fixed.

Question 2

How can a white dwarf be hotter than our Sun, yet much less luminous?
 
  What will be an ideal response?

[angrybirds13579]

Answer to Question 1

D

Answer to Question 2

They are only about as big as Earth, so their surface area is about 10,000X less than the Sun's.