Scientists have direct evidence of the Earth's structure to A) ...

[folubunmi]

Scientists have direct evidence of the Earth's structure to
 
  A) the inner core.
  B) the upper mantle (250 km (155 mi)).
  C) about 2 km (1.2 mi) from the surface.
  D) 10 km (6 mi) from the surface, based on the deepest well shaft.

Question 2

Which two gases are primarily responsible for the greenhouse effect because of their ability to absorb infrared energy?
 
  A) oxygen and hydrogen
  B) ozone and dust
  C) nitrogen and oxygen
  D) water vapor and carbon dioxide

[bhavsar]

Answer to Question 1

C

Answer to Question 2

D