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

Author Question: The rate of cratering: A) has remained constant over the last 4.6 billion years. B) has recently ... (Read 82 times)

ap345

  • Hero Member
  • *****
  • Posts: 537
on: Jul 27, 2018
The rate of cratering:
 
  A) has remained constant over the last 4.6 billion years.
  B) has recently increased with more collisions in the asteroid belt.
  C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud.
  D) shows that large asteroid impacts are more common now than in the past.
  E) shows that most interplanetary debris was swept up soon after the formation of the solar system.

Question 2

While our Milky Way's black hole is not massive enough to have once been quasar, it must have passed through its Seyfert phase by 3.5 billion years ago. Explain how we know this.
 
  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

stanleka1

  • Sr. Member
  • ****
  • Posts: 325
Reply #1 on: Jul 27, 2018
Answer to Question 1

E

Answer to Question 2

We are here. Life on Earth would have been destroyed by the violent activity of an active nucleus only 30,000 light years away, in the core of our own galaxy, yet the fossil record tells us life has persisted on Earth uninterrupted for at least 3.5 billion years.


ap345

  • Hero Member
  • *****
  • Posts: 537
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


stanleka1

  • Sr. Member
  • ****
  • Posts: 325
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar
Exercise increases the heart rate. Exercise increases the heart rate.
The rate of global emissions is rising rapidly, especially in India and China The rate of global emissions is rising rapidly, especially in India and China
How to calculate invest at each rate How to calculate invest at each rate
Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ... Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ...
The rate of replacement of a recessive allele d by the dominant allele D by mutation alone. Even tho The rate of replacement of a recessive allele d by the dominant allele D by mutation alone. Even tho
Video: Virtual Tour of the Heart

For a complete list of videos, visit our video library