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End of the Mesozoic era
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∙ 8y ago
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Why can the iridium sediment layer be used as evidence to support the main theory about the extinction of the dinosaurs?
High concentrations of iridium appears in a layer called the K-T boundary which corresponds to the time of the extinction of non-avian dinosaurs. Iridium is a metal that is rare on earth but common on many bodies in outer space such as asteroids. It is believed that an asteroid collided with earth 65.5 million years ago, setting in motion events that would cause a mass extinction, spreading a layer of iridum in the process.
What layer of Earth's mantle do plates slide over?
Tectonic plates are part of the Earth's crust known as the lithosphere. They slide over the outer part of the Earth's mantle called the asthenosphere.
What observations did you make as to how ice deposited sediments over time?
What observations did you make as to how ice deposited sediments over time
What layer of the earth supports the crust?
The upper part of the mantle called the asthenosphere is the layer on which the earth's lithosphere (crust plus uppermost rigid mantle) rides.This soft layer serves as support for the crust to float and move over time due to its partial suspension.
How High does the Troposphere go?
Over 99% of the mass of the earth's atmosphere is contained in two layers: the troposphere and the stratosphere. Most of the earth's atmosphere (80 to 90%) is found in the troposphere, the atmospheric layer where we live. This layer, where the earth's weather occurs, is within about 12 km (7 miles) of the earth's surface.
Why can the iridium sediment layer be used as evidence to support the main theory about the extinction of the dinosaurs?
High concentrations of iridium appears in a layer called the K-T boundary which corresponds to the time of the extinction of non-avian dinosaurs. Iridium is a metal that is rare on earth but common on many bodies in outer space such as asteroids. It is believed that an asteroid collided with earth 65.5 million years ago, setting in motion events that would cause a mass extinction, spreading a layer of iridum in the process.
What is the area of the ozone layer?
The ozone layer is spread all over. It is over the whole earth.
Where is the ozone layer formed and stored?
Ozone layer is formed all over the earth. It is there in stratospheric layer.
Why is the ozone layer is essential to the survival of life on earth?
Ozone layer protects us from the UV rays. These rays are harmful for life on earth.
Why is the extinction of the dinosaurs attributed to an asteroid impact?
The original observation was that in the fossil records there is a layer with high levels of iridium and osmium at the time of dinosaur extinction. Iridium and osmium are common is asteroids. For the layer to be all over the globe it must have been a major strike which would have caused global wide climate change causing a mass extinction.
What happens to the ozone layer surronding the earth?
The ozone layer surrounding earth is being depleted. It is due to the use of CFC's.
What mean ozen layer?
Ozone layer is a protective layer over the earth. It protects us from the UV rays of the sun.
What is significant about the discovery of iridium at the K-T boundry?
Iridium is a very rare element in Earth's crust, however rocks that have an age equal to that of the K-T boundary are significantly enriched in iridium. It is theorised that this enrichment is due to the impact of an asteroid with Earth (as asteroids are rich in iridium and the resultant massive explosion spread iridium enriched debris all over the world). This asteroid impact is thought to have been a significant event in the mass extinction even that wiped out the dinosaurs. This is known as the Alverez hypothesis. For more information, please see the related link.
Whae is ozone layer depletion?
Ozone layer depletion is the thinning of ozone layer. It is most evident over the poles on earth.
How does coal gets between layers of shale?
First, a layer of clay that would turn to shale was deposited. Next, a layer of plant life that would become coal was deposited, then another layer of clay. Over time, the clay became shale, and the plants became coal. Sort of like how did the blanket on your bed get between the sheets and the bedspread? You put on the sheets, then the blanket, then the bedspread.
What is the layer of sediment called?
It is called sedimentation.
Where is the hole in your ozone layer?
Ozone layer is depletion is happening in the stratosphere of the earth's atmosphere. It is majorly concentrated over Antarctica's atmosphere.
