This topic contains a solution. Click here to go to the answer

Author Question: _____ are massive objects destined to become planets. A) Planetesimals B) Protoplanets C) ... (Read 76 times)

tiffannnnyyyyyy

  • Hero Member
  • *****
  • Posts: 512
_____ are massive objects destined to become planets.
 
  A) Planetesimals
  B) Protoplanets
  C) Preplanets
  D) Pseudoplanets

Question 2

Which of the following statements is true in the context of radioactive elements?
 
  A) The abundances of the daughter isotopes of radioactive elements in a rock gradually decrease.
  B) The abundance of a radioactive element in a rock gradually decreases.
  C) Uranium-238 has the longest half-life among all the other radioactive substances.
  D) Potassium-40 has the longest half-life among all the other radioactive substances.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bdobbins

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

B

Answer to Question 2

B




bdobbins

  • Sr. Member
  • ****
  • Posts: 326

 

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

For a complete list of videos, visit our video library