What created Earth's moon? a. The expulsion of rocky mantle ...

[Frost2351]

What created Earth's moon?
  a. The expulsion of rocky mantle after a collision with a planetary body
  b. The initial big bang expansion event
  c. The formation of a new star
  d. The collision between two older moons

Question 2

What was the main requirement for the development of life on Earth?
  a. Exposure to sunlight
  b. Absence of free oxygen
  c. Simple sugars
  d. Energization from electrical sparks

[Perkypinki]

Answer to Question 1

ANS: A
The moon orbiting Earth resulted from the initial collision with another planetary body about the size
of Mars. The collision ejected some rocky mantle while the metallic core of that body fell into Earth's
core. The rocky mantle began to condense to form the moon we know today. Information can be found
in the section Earth, Ocean, and Atmosphere Accumulated in Layers Sorted by Density

Answer to Question 2

ANS: B
In laboratory experiments, gases and compounds thought to be similar to Earth's early atmosphere
were exposed to light, heat, and electrical sparks; the result was the production of simple sugars, small
proteins, and nucleotides. The absence of free oxygen seemed to be the key factor. Information can be
found in the section Life Probably Originated in the Ocean.

[Frost2351]

TYSM

[jackie]

Excellent