Author Question: What are radioactive decay rates in minerals affected by? A) temperature and pressure B) ... (Read 152 times)

plus1

  • Hero Member
  • *****
  • Posts: 676
What are radioactive decay rates in minerals affected by?
 
  A) temperature and pressure
  B) nothing
  C) variations in gravity and magnetism
  D) heat

Question 2

How have scientists determined the age of the Earth?
 
  What will be an ideal response?



rosiehomeworddo

  • Sr. Member
  • ****
  • Posts: 306
Answer to Question 1

Answer: B

Answer to Question 2

Answer: Eighteenth-century geologists, including James Hutton, applied scientific observations and principles to conclude that the geologic rock record requires that Earth be extraordinarily ancient. Lord Kelvin calculated Earth's age based on a conceptual model of how much the planet has cooled since its origin. His calculations suggested an age in the range of 20-40 million years. John Joly calculated the age of the oceans based on a conceptual model of how long it would take Earth's rivers to transport enough salt to account for the current saltiness of the ocean. His calculations suggested an age of 80-100 million years. Kelvin's and Joly's calculations were correct but included assumptions that could not be verified at the time of their work. Reconsideration of their assumptions shows that the ages they calculated are minimum values and, therefore, Earth must be still older.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

For a complete list of videos, visit our video library