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Why are andesitic and granitic rocks confined to the continents and ocean margins but absent from deep ocean basins?
The igneous rock underlying the deep ocean basins is basaltic, as its source material comes from the asthenosphere. Andesitic igneous rock is formed at colliding plate margins, where subducting oceanic crust is partially melted and undergoes differentiation as it rises through the continental crust. Granitic rock is less dense than oceanic crust and composes the continents.
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Are all plate boundaries located along the margins of continents?
No. Many plate boundaries are on the seafloor far from continents and several are well within continents.
What kind of volcanoes are found along continental margins?
Volcanoes found along continental margins are typically stratovolcanoes or composite volcanoes. These volcanoes are characterized by their steep-sided appearance due to alternating layers of lava flows, ash, and volcanic rocks. They are formed where tectonic plates converge and one plate is forced beneath the other in a process known as subduction.
Why are hot deserts located on the western margins of continents in the tropical regions?
1.westerlies tande currents ke upar se bahte hah aur apna moisture koh dehti haa jab vah western margins par pahunchti haa toh wo dry hoti haa aur koi rain nahi karti. 2.due to cooling efeects of cold currents.
What are the 3 main regions of the ocean floor?
The three main regions of the ocean floor are the continental margins, the ocean basins, and the mid-ocean ridges. Continental margins are the shallow, submerged edges of continents. Ocean basins are the deeper areas of the ocean floor beyond the continental margins. Mid-ocean ridges are underwater mountain ranges where tectonic plates move apart and magma rises to create new oceanic crust.
Do earthquakes occur at constructive margins?
Yes, earthquakes can occur at constructive margins where tectonic plates are moving apart. As the plates separate, tension builds up in the crust which can lead to faults slipping and causing earthquakes. However, earthquakes at constructive margins tend to be less frequent and less intense compared to those at other types of plate boundaries.
What is something similar between active and passive margins continents?
Both active and passive margins are found at the edges of continents. Active margins are associated with tectonic activity and are typically marked by earthquakes, volcanoes, and mountain building, while passive margins are geologically stable and characterized by broad continental shelves and sediment deposition.
Are all plate boundaries located along the margins of continents?
No. Many plate boundaries are on the seafloor far from continents and several are well within continents.
What are the true edges of continents?
The true edges of continents are known as continental margins, which consist of the continental shelf, continental slope, and continental rise. These margins mark the transition from the continent to the ocean basin and can extend hundreds of kilometers from the shoreline.
Where is andesitic magma found?
Andesitic magma is commonly found in subduction zones where oceanic crust is being forced beneath continental crust. These environments are typically associated with volcanic arcs and stratovolcanoes. Examples of where andesitic magma is found include the Andes Mountains in South America and the Cascades in the western United States.
What kind of volcanoes are found along continental margins?
Volcanoes found along continental margins are typically stratovolcanoes or composite volcanoes. These volcanoes are characterized by their steep-sided appearance due to alternating layers of lava flows, ash, and volcanic rocks. They are formed where tectonic plates converge and one plate is forced beneath the other in a process known as subduction.
Are the edges of continents the same as the boundaries of plates?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Are the edges of the continents the same as the boundaries of the plates?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Are the edge of continents the same as the boundaries of plates?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Why can paper cutouts of the continents including the continental margins be pieced together to form a single whole?
Paper cutouts of the continents can be pieced together to form a single whole is because the continents were at one point all connected, which was the super continent Pangaea.
Why does the oceanic crust move below continental crust?
The basaltic oceanic crust is more dense than the granitic continental crust. Therefore, when the two meet at plate margins, the oceanic crust usually subducts beneath the continental plate.
Why most world deserts are located in the western margins of the continents in the subtropics?
because the places there are more warm. if it was for instance England then it would be all wet
Why most of the world's deserts are located in the western margins of continents in the sub tropics?
It is so because the westerlies(a kind of permanent or planetary wind) loses its moisture while it reaches the western margins of the world so it is not able to shed rains in that particular region.
