Why is Earth Mostly Crater-Free Compared to the Moon?
CREDIT: raatcc36 | sxc.hu
All the activity on Earth's surface is akin to a constant makeover.
Much of our planet's geological history was folded back inside long ago. Some of that is regurgitated by volcanoes, but the results are pretty hard to study. Even more recent events evident on the surface — craters that can by millions of years old — get overgrown by vegetation, weathered by wind and rain, and modified by earthquakes and landslides.
The Moon, meanwhile, is geologically quiet and has almost no weather; its craters tell a billions-year-long tale of catastrophic collisions. Interestingly, some of the oldest Earth rocks might be awaiting discovery on the Moon, having been blasted there billions of years ago by the very asteroid impacts that rattle both worlds.
Life's Little Mysteries: Gift Edition Hardcover Book
Uncover the truth behind more than 100 mysteries that surround us every day with our new hardcover book! Perfect for gifts and classrooms, and suitable for all ages. Some of the included mysteries are:
- Why Do Cats Land on Their Feet?
- How Long Does it Take to Make Petrified Wood?
- What Everyday Things Around Us Are Radioactive?
Find out all of this and much, much more in our NEW hardcover book.
It makes a great gift idea for all ages. more info>>