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

Author Question: Why are ultramafic volcanics rare in rocks that are much younger than Archean in ... (Read 78 times)

jasdeep_brar

  • Hero Member
  • *****
  • Posts: 569
on: Jul 13, 2018
Why are ultramafic volcanics rare in rocks that are much younger than Archean in age?

Question 2

Which statement about caves is false?
 A)They form underwater.
 B)They are formed by deposition of calcium carbonate.
 C)They form naturally and are open to the surface.
 D)The majority of caves are small.
 E)They are commonly found in regions with karst topography.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

leeeep

  • Sr. Member
  • ****
  • Posts: 315
Reply #1 on: Jul 13, 2018
Answer to Question 1

Earth has cooled from its early stages because radiogenic heat production decreased. The Archean near-surface temperatures have not been high enough for ultramafic magma to reach the surface.

Answer to Question 2

B


jasdeep_brar

  • Member
  • Posts: 569
Reply 2 on: Jul 13, 2018
Thanks for the timely response, appreciate it

sultana.d

  • Member
  • Posts: 320
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Did you know?

Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

Did you know?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his
Lithops in rocks Lithops in rocks
Leonardo da Vinci, Madonna of the Rocks. Leonardo da Vinci, Madonna of the Rocks.
Common Metamorphic Rocks Common Metamorphic Rocks
Earth’s Oldest Preserved Rocks – 3.8 Billion Years Old, Greenland Earth’s Oldest Preserved Rocks – 3.8 Billion Years Old, Greenland
A pedigree for a rare autosomal recessive trait. In these pedigrees, most affected individuals have A pedigree for a rare autosomal recessive trait. In these pedigrees, most affected individuals have
Video: How do the different types of chromatography work? (No Audio)

For a complete list of videos, visit our video library