Moon's crust as fractured as can be

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The moon's crust is highly fractured due to the Late Heavy Bombardment, which occurred around 4 billion years ago when numerous asteroids impacted its surface, creating craters and fissures. This bombardment increased the moon's porosity, resulting in a network of seams beneath the surface. In contrast, Earth's crust remains relatively intact due to tectonic activity, higher surface gravity, and the presence of liquid water, which help repair and reshape its structure. The discussion highlights that while the oldest parts of Earth's crust are older than the bombardment, ongoing geological processes continuously alter and renew it. The differences in crustal integrity between the moon and Earth are attributed to these dynamic processes.
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Moon's crust as fractured as can be

Scientists believe that about 4 billion years ago, during a period called the Late Heavy Bombardment, the moon took a severe beating, as an army of asteroids pelted its surface, carving out craters and opening deep fissures in its crust. Such sustained impacts increased the moon's porosity, opening up a network of large seams beneath the lunar surface.

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How did the moon take so many hits but the Earth relativity unscathed?
 
I don't think it did.

From wiki: https://en.wikipedia.org/wiki/Late_Heavy_Bombardment

The Late Heavy Bombardment (abbreviated LHB and also known as the lunar cataclysm) is a hypothetical event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago,[1] corresponding to the Neohadean and Eoarchean eras on Earth. During this interval, a disproportionately large number of asteroids apparently collided with the early terrestrial planets in the inner Solar System, including Mercury, Venus, Earth, and Mars.
 
Drakkith said:
I don't think it did.
But Earth's crust is in good order, right?
 
We have tectonic activity, and also a higher surface gravity and liquid water to "fix" rough structures.
 
mfb said:
We have tectonic activity, and also a higher surface gravity and liquid water to "fix" rough structures.
You mean the Earth has a kind of puddy or spackling? :smile:
 
What is "puddy"?

Parts of the crust get submerged below other parts, enter the molten mantle and melt, while elsewhere new crust material solidifies out of the mantle.
The oldest known parts of the crust are about 4.3 billion years old (older than the late heavy bombardment), but most parts are younger.

Add erosion, the tendency of water to enter underground cavities (which can speed up a collapse), earthquakes, ... and cavities have a hard time surviving for long timespans.
 
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mfb said:
What is "puddy"?
Like what you use to patch a hole in dry wall :biggrin:
 

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