« previous next »

Author Question: What do we mean by a mass extinction? A) the extinction of large animals, such as dinosaurs B) ... (Read 120 times)

Lobcity

  • Hero Member
  • *****
  • Posts: 524
on: Jul 27, 2018
What do we mean by a mass extinction?
 
  A) the extinction of large animals, such as dinosaurs
  B) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time
  C) an extinction caused by the impact of an asteroid or comet
  D) the extinction of any species of plant or animal that has mass

Question 2

Nearly every aspect of astronomy is related in some way to the existence of gravity and to the motions which are responsible for a balance against gravity. How does this balance play a role for the miscellaneous objects of the solar system (i.e.
 
  , the asteroids and comets)? How can some aspect of this be used as a tool to determine masses in the solar system?


wergv

  • Sr. Member
  • ****
  • Posts: 365
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

Asteroids and comets all orbit the Sun, some with highly eccentric orbits. Some comets have periods of millions of years. Gravity acting on and between comets and asteroids can be used to determine their masses and the masses of bodies affecting them.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Lobcity

  • Hero Member
  • *****
  • Posts: 524
Reply #2 on: Jul 27, 2018
TY


wergv

  • Sr. Member
  • ****
  • Posts: 365
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

The four ways in which animals exchange heat with the environment are radiation, evaporation, convec The four ways in which animals exchange heat with the environment are radiation, evaporation, convec
Male lying supine with large ecchymosis on lateral rib cage and shoulder. Male lying supine with large ecchymosis on lateral rib cage and shoulder.
Middle adulthood can bring large-scale changes in lifestyle and interests, as illustrated by this ph Middle adulthood can bring large-scale changes in lifestyle and interests, as illustrated by this ph
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Large water tank, possibly a public or ritual bathing area, from Mohenjo-daro, Indus Valley ... Large water tank, possibly a public or ritual bathing area, from Mohenjo-daro, Indus Valley ...
Air-Mass Source Regions for North America Air-Mass Source Regions for North America
Video: Cardiac Cycle (Part 1 of 4)

For a complete list of videos, visit our video library