How were the lunar maria formed? What will be an ideal ...

[tichca]

How were the lunar maria formed?
 
  What will be an ideal response?

Question 2

What positive effect have supernovae had on the development of life on Earth?
 
  a. Supernovae are the main source of background radiation needed for mutations.
  b. Chemical elements necessary for life can only be formed in supernovae.
 c. The formation of the Sun was triggered by a supernova event.
 d. Planets form by accretion of material in the expanding remnant of a supernova.
  e. Neutrino bombardment was necessary to form the first simple proteins.

[ms_sulzle]

Answer to Question 1

The maria are ancient lava flows that have apparently covered older, cratered lowlands.
Although most of the Moon cooled rapidly after its formation, radioactive decay heated material deep in the crust, and part of it melted. Molten rock followed the cracks up to the surface and flooded the giant basins with successive lava flows of dark basalts from about 4 billion to about 2 billion years ago. This formed the maria.

Answer to Question 2

b

[tichca]

Thanks

[ms_sulzle]

Welcome