This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Briefly explain the current theory of Earth's origin, including how and why it came to be ... (Read 35 times)

jazziefee

  • Hero Member
  • *****
  • Posts: 505
on: Jul 15, 2018

Briefly explain the current theory of Earth's origin, including how and why it came to be differentiated
  by composition. What will be an ideal response?



Question 2

Describe how the universe, galaxies, stars, and chemical elements formed What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kardosa007

  • Sr. Member
  • ****
  • Posts: 300
Reply #1 on: Jul 15, 2018
Answer to Question 1

In the solar nebula, gases and solid particles condensed in localized eddies and then accreted into
planetesimals. These bodies collided and grew until they became planets. The planets nearer the Sun
were small and composed of rock and metallic elements. One of these was Earth. Heat was generated
by meteorite impacts, gravitational compression, and nuclear reactions. The heat caused the material to
melt. Since it could now move, dense metals sank to the core and denser silicates to the mantle.
Lighter silicates rose to form the crust.



Answer to Question 2

Scientists believe that the universe originated with the Big Bang approximately 14 billion years ago.
At the moment of the Big Bang, there was only energy, no matter. In the first second following the Big
Bang, the four basic forces separated, and the universe experienced enormous expansion. Galaxies and
stars came together, and the chemical makeup of the universe changed. In the early universe, the only
chemical elements were hydrogen and helium, but now 2 of the universe is all other elements by
weight.



jazziefee

  • Member
  • Posts: 505
Reply 2 on: Jul 15, 2018
Great answer, keep it coming :)

scikid

  • Member
  • Posts: 300
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern
Contact theory indicates that prejudice decreases and relations improve when individuals of ... Contact theory indicates that prejudice decreases and relations improve when individuals of ...
Jet streams and Earth’s heat budget Jet streams and Earth’s heat budget
Foundations of Earth Science, 7th Edition Foundations of Earth Science, 7th Edition
Gravity on Earth Vs. Gravity in Bed Gravity on Earth Vs. Gravity in Bed
Video: Brain Anatomy Animation (Part 1 of 2)

For a complete list of videos, visit our video library