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What is material with granitic composition that erupts at Earth's surface?

Material with a granitic composition that erupts at the surface is called rhyolite.


Do Volcanic necks and dikes form when magma cools and hardens into rock after reaching the surface?

No, these features form when magma cools into rocks BEFORE reaching the surface.


What convergent plate boundaries are active volcanoes not likely to be located?

Active volcanoes are not likely to be located at convergent boundaries where an oceanic plate subducts beneath a continental plate because the melting point of the oceanic crust is lower, causing it to melt and create volcanic features before reaching the surface. Instead, active volcanoes are more commonly found at divergent boundaries where plates move apart.


What is Magma reaching earths surface flows from a volcano as blank?

Magma that reaches the Earth's surface flows from a volcano as lava. When magma erupts through a volcano, it becomes lava, which can flow in various forms, such as basaltic, andesitic, or rhyolitic, depending on its composition. As lava cools, it solidifies and can form different types of volcanic rock.


What geologic features might form at the surface of plate a?

At the surface of a tectonic plate, various geologic features can form depending on the plate's interactions with neighboring plates. These include mountains and mountain ranges at convergent boundaries due to the collision of plates, rift valleys at divergent boundaries where plates are pulling apart, and volcanic activity at both convergent boundaries (where one plate subducts under another) and divergent boundaries (where magma rises to the surface). Additionally, transform boundaries can create fault lines and associated earthquake activity.