Author Question: Describe the processes by which Earth formed. What will be an ideal ... (Read 100 times)

SGallaher96 · **on:** Aug 22, 2018

Describe the processes by which Earth formed. What will be an ideal response?

Question 2

The presence of ____________ on a planet could be an indication of past or present forms of life. Fill in the blank(s) with the appropriate word(s).

aidanmbrowne · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

The universe began during an expansion event known as the big bang approximately 13.7
billion years ago. During its early phases, the universe was very hot, but over time cooled and
expanded to form hydrogen atoms. Further cooling led to the formation of galaxies, large,
rotating aggregations of stars, dust, and gas held together by gravity. Stars and planets
formed according to the condensation theory and accretion.

Answer to Question 2

oxygen