« previous next »

Author Question: Explain how we can estimate the geological age of a planetary surface from its number of impact ... (Read 137 times)

natalie2426

  • Hero Member
  • *****
  • Posts: 524
on: Jul 27, 2018
Explain how we can estimate the geological age of a planetary surface from its number of impact craters.
 
  What will be an ideal response?

Question 2

Describe several features on the Earth's crust explained by plate tectonics.
 
  What will be an ideal response?


abctaiwan

  • Sr. Member
  • ****
  • Posts: 355
Reply #1 on: Jul 27, 2018
Answer to Question 1

Even though impacts still occur today, the vast majority of craters formed during the bombardment period that ended around 3.8 billion years ago. A surface region that is still saturated with craters must have remained essentially undisturbed for the last 3.8 billion years. In contrast, a surface region that has few craters indicates that the original craters must have been somehow erased since then.

Answer to Question 2

Mountain ranges, volcanic mountain chains, mid-ocean rifts, oceanic trenches, faults, earthquakes, and plate motion.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Parts of the Hand Used in Palpation; Dorsal Surface Parts of the Hand Used in Palpation; Dorsal Surface
Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith
Views of Earth’s Surface Views of Earth’s Surface
Surface Features on Europa Surface Features on Europa
A woman in a net on a Congo shore. Although the importation of slaves was illegal after 1807, histor A woman in a net on a Congo shore. Although the importation of slaves was illegal after 1807, histor
Genomic and fossil evidence has been used to estimate the times of divergence of human and Neanderth Genomic and fossil evidence has been used to estimate the times of divergence of human and Neanderth
Video: T cell receptors

For a complete list of videos, visit our video library