4 – Ocean Salt,
Most of the salt in our ocean comes from rocks on the shores, mainly because rainwater which is naturally acidic breaks down the rock and distributes their components into the water
Seawater salt is so dense that if you were to dissolve all the oceans in the world and spread the remaining salt over all the land on earth, you’d have a 500 foot thick salt layer coating EVERYTHING.
5 – Rocks Can Walk,
There exists a flat lakebed in Death Valley known as Racetrack Playa, in which rocks physically move from place to place
And it’s not just small rocks, but ones weighing tens or hundreds of pounds – the theory goes that these ice-encrusted rocks are flooded by meltwater from the hills
This makes everything nice and slick which, along with a hard breeze, allows the rock to travel
6 – Twin Planet,
There is a well known theory that at the beginning of Earth’s development there existed a smaller twin planet known as Theia, roughly the size of mars
5 billion years ago it crashed into Earth and while most of it was absorbed into Earth’s crust, the rest drifted off and formed that celestial body known as the Moon
The reason this theory came about is because typically planets of Earth’s size don’t have moons quite so big, and not to mention various matters found on the Moon are somehow shared with Earth.
Source: http://www.planetdolan.com/15-things-you-didnt-know-about-earth/2/
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