« previous next »

Author Question: What evidence tells us that early Earth contained radioactive isotopes that are no longer present? ... (Read 12 times)

crobinson2013

  • Hero Member
  • *****
  • Posts: 535
on: Jul 16, 2018
What evidence tells us that early Earth contained radioactive isotopes that are no longer present?
 
  What will be an ideal response?

Question 2

Has the innermost part of Earth's core always been solid and constant in size?
 
  What will be an ideal response?


srodz

  • Sr. Member
  • ****
  • Posts: 333
Reply #1 on: Jul 16, 2018
Answer to Question 1

The daughter products of these isotopes are present in Earth rocks. They are also present in Moon rocks and in meteorites.

Answer to Question 2

No, the Earth's entire core was once molten. The core started to crystallize from the inside outward and continues to crystallize today. The inner core is slowly enlarging.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
Mira as seen from the Earth Mira as seen from the Earth
Structure of the Early Universe Structure of the Early Universe
The Atmosphere Screens Earth from Harmful Solar Radiation The Atmosphere Screens Earth from Harmful Solar Radiation
High rates of rural poverty have been a part of the United States from its origin to the present. ... High rates of rural poverty have been a part of the United States from its origin to the present. ...
Literacy Development in the Early Years: Helping Children Read and Write Literacy Development in the Early Years: Helping Children Read and Write
Video: What is Cholesterols? Introduction to Lipoproteins

For a complete list of videos, visit our video library