Assignment 4

Exercise 4: Cratering Frequency on the Earth

Due: Turn in Tables 1 and 2 before class on November 13, 2020

In this exercise, you will make rough estimates of the rate of cratering on the Earth; solarviews.com/eng/tercrate.htm is a nice reference for Terrestrial impact craters.

1. Fill in Tables 1 and 2 using the crater list found on Views of the Solar System; http://solarviews.com/eng/crater.htm (the link found on the site solarviews.com/eng/tercrate.htm above). Keep a copy of your Tables 1 and 2.


Table 1: Terrestrial Craters: Craters Younger and Older than 300 Million Years

Crater Size

Number of Craters Older than 300 My

Age of the Oldest Crater in Group

Number of Craters Younger than 300 My

D ≥ 151 km

craters

My

craters

150 km ≥ D ≥ 101 km

craters

My

craters

100 km ≥ D ≥ 51 km

craters

My

craters

50 km ≥ D ≥ 11 km

craters

My

craters

10 km ≥ D ≥ 1 km

craters

My

craters

D < 1 km

craters

My

craters

Table 2: Total Numbers of Terrestrial Craters

Crater Size

Number of Craters in Group

Age of the Oldest Crater in Group

D ≥ 151 km

craters

My

150 km ≥ D ≥ 101 km

craters

My

100 km ≥ D ≥ 51 km

craters

My

50 km ≥ D ≥ 11 km

craters

My

10 km ≥ D ≥ 1 km

craters

My

D < 1 km

craters

My

Note--In the Table on the link, Ma stands for million years;in the above table My stands for million years