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 60 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 :)

mammy1697

  • Member
  • Posts: 341
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Inverse Relation Between IQ and Disease. Could this explain the Flynn effect? Inverse Relation Between IQ and Disease. Could this explain the Flynn effect?
Distance from Earth to Sun schematic Distance from Earth to Sun schematic
Co-current flow in a concentric tube heat exchanger Co-current flow in a concentric tube heat exchanger
Wash all surfaces in a massage room daily, including the massage table. Wash all surfaces in a massage room daily, including the massage table.
Moving currents are affected by Earth’s rotation Moving currents are affected by Earth’s rotation
Gravitational Potential Energy for the Earth problem Gravitational Potential Energy for the Earth problem
Video: What are Strong & Weak Acids and How they're different?

For a complete list of videos, visit our video library