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The term 'tombstone layer' is a colloquialism associated with an extinction event ~ 66 million years ago leading to the demise of the dinosaurs and about 70% of other life on earth. The layer is a thin (few inches) clay deposit containing iridium (a very rare element) at a level about 100 times its normal distribution in the earths crust. The layer has been positively linked to the Chicxulub impact crater discovered in the Yucatan Penisula, Mexico and credited with being the extinction event that ended in the mass extinction, thus the term 'tombstone layer'.
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What is the rare element found in the tombstone layer of the earth?
iridium
What is the earths second layer of earths atmosphere?
STRATOSPHERE
The layer of rock that comprimises 67 of earths mass?
the layer of rock that comprises 67% of earths mass
The crust is only what of earths thickness?
half of earths layer
Earths thinnest layer is the?
The earth thinnest layer is the crust.
Which earths layer is the thinest?
The crust is the thinnest layer of the Earth.
Can the troposphere layer be considered as earths first protective layer?
Actually, the Troposphere Layer can be considered as Earth's first protective layer, because its well-the atmosphere's first layer. You can think of it that way to remember which is Earths first layer.
What layer below earths outher layer?
The layer below the earth's outer layer is mesosphere. It is the 3rd layer.
The earths middle layer?
Mantle.
What the earths outer layer?
Crust
What layer of the earths stratosphere starts with an O?
the ozone (O3) layer
Another name for the water layer of the earth?
the earths outer layer
