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Author Question: What is the current debate about the origin of water on Earth? What will be an ideal ... (Read 82 times)

mydiamond

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on: Jul 27, 2018
What is the current debate about the origin of water on Earth?
 
  What will be an ideal response?

Question 2

The period-luminosity relation for Cepheid and RR Lyrae variable stars can be used for ______________.
 
  Fill in the blank(s) with correct word


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blakeserpa

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Reply #1 on: Jul 27, 2018
Answer to Question 1

Water on Earth may have arrived from the bombardment of icy planetesimals, or comets. Evidence has shown from comet LINEAR that it contained water with a ratio of isotopes similar to the water on Earth.

Answer to Question 2

distance measurements


mydiamond

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Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

flexer1n1

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Reply 3 on: Yesterday
Wow, this really help

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