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The layer of iridium found all over Earth is known as the iridium anomaly. It is believed to have originated from a large asteroid impact that occurred around 66 million years ago, leading to the mass extinction of the dinosaurs. The presence of this iridium layer is one of the key pieces of evidence supporting the theory of an asteroid impact causing the mass extinction event.
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What era had a layer of iridium deposited all over Earth?
The layer of iridium deposited all over Earth is known as the Cretaceous-Paleogene boundary, which marks the end of the Cretaceous period and the beginning of the Paleogene period. This layer is believed to have been deposited around 66 million years ago when a massive asteroid impact caused widespread extinctions, including the dinosaurs.
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.
Which cave formation is formed along the walls of the cave where water flows and calcite is deposited?
Stalactites are cave formations that hang from the ceiling and are formed by the dripping of mineral-rich water containing calcite. Stalactites grow downwards over time as the calcite is deposited layer by layer.
The layer below the earth's outer layer is?
The layer below Earth's outer layer is the mantle. It is composed of solid rock that is able to flow slowly over long periods of time. The mantle is much thicker than the Earth's crust and makes up the majority of the Earth's volume.
What is the third layer of the earth?
The third layer of the Earth is the mantle. It is located beneath the Earth's crust and is composed of solid rock that is capable of flowing slowly over long periods of time. The mantle is the thickest layer of the Earth, making up about 84% of the Earth's volume.
What era had a layer of iridium deposited all over Earth?
The layer of iridium deposited all over Earth is known as the Cretaceous-Paleogene boundary, which marks the end of the Cretaceous period and the beginning of the Paleogene period. This layer is believed to have been deposited around 66 million years ago when a massive asteroid impact caused widespread extinctions, including the dinosaurs.
What has to happen before a rock layer can be deposited?
Before a rock layer can be deposited, the area must undergo erosion and weathering. This breaks down existing rocks into sediment which can then be transported and deposited in a new location. The process of deposition occurs when the sediment settles into a new location and forms a layer over time.
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 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.
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.
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.
Which cave formation is formed along the walls of the cave where water flows and calcite is deposited?
Stalactites are cave formations that hang from the ceiling and are formed by the dripping of mineral-rich water containing calcite. Stalactites grow downwards over time as the calcite is deposited layer by layer.
Whae is ozone layer depletion?
Ozone layer depletion is the thinning of ozone layer. It is most evident over the poles on earth.
The layer below the earth's outer layer is?
The layer below Earth's outer layer is the mantle. It is composed of solid rock that is able to flow slowly over long periods of time. The mantle is much thicker than the Earth's crust and makes up the majority of the Earth's volume.
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.
