Question

We classify moons as formerly active if they a. are completely covered in craters. b. have no young craters. c. have regions with few craters. d. have regions with no craters.

Name: Problem 14, Chapter 11: 21st Century Astronomy
Uploaded: 2020-07-14T00:05:04-08:00
Duration: 2 min 34 s
Channel: Matthew Miranda
Description: We classify moons as formerly active if they a. are completely covered in craters. b. have no young craters. c. have regions with few craters. d. have regions with no craters.

   We classify moons as formerly active if they
a. are completely covered in craters.
b. have no young craters.
c. have regions with few craters.
d. have regions with no craters.

21st Century Astronomy

Laura Kay, Stacy… 5th Edition

Chapter 11, Problem 14

Instant Answer

Solved by Expert Matthew Miranda

07/14/2020

Step 1

There are three categories: active, dead, and formerly active. Active moons have ongoing geological activity, such as volcanoes. Dead moons are completely covered with craters and show no signs of seismic activity since their formation. Show more…

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We classify moons as formerly active if they a. are completely covered in craters. b. have no young craters. c. have regions with few craters. d. have regions with no craters.

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Key Concepts

Surface Resurfacing

This concept refers to geological processes, such as volcanic activity or tectonic movements, that renew or modify a celestial body’s surface. Resurfacing can erase or reduce the number of craters, indicating that a normally old surface has been geologically active in the past.

Impact Cratering

This is the process by which meteoroids, asteroids, or comets strike a celestial body, creating craters. The number and distribution of impact craters on a surface serve as a record of the bombardment history and are used to estimate the relative ages of planetary surfaces.

Crater Counting Chronology

Crater counting is a method of estimating surface age by analyzing the density of craters. A surface with many craters is usually older, while areas with fewer craters suggest more recent geological processes that have altered or reset the surface.

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