Which of the following help create volcanoes?
plate tectonics
landslides
cracks in Earth's crust
built up magma
built up magma
Plate tectonics, built up magma, and cracks in the Earth's surface. :)
The correct answer is "plate tectonics" and "built up magma."
To determine the answer, let's go through each option and eliminate the incorrect ones:
1. Plate tectonics: This is the movement of the Earth's lithosphere, which is composed of several large and small tectonic plates. Volcanoes are often formed at plate boundaries where plates either converge (move towards each other), diverge (move away from each other), or slide past each other. These plate movements can cause magma to rise to the surface and create volcanic activity.
2. Landslides: While landslides can sometimes accompany volcanic eruptions, they do not directly create volcanoes. Landslides are primarily a result of gravity, when large amounts of soil, rocks, or debris slide down a slope.
3. Cracks in Earth's crust: These cracks, also known as faults, can be an indication of tectonic activity but are not necessarily responsible for the creation of volcanoes. Faults occur when there is a fracture or break in the Earth's crust due to the movement of tectonic plates. While earthquakes can be associated with these cracks, the formation of volcanoes is more closely linked to plate tectonics.
4. Built up magma: This is another correct option. When magma accumulates beneath the Earth's surface due to various geological processes, it can eventually lead to the formation of a volcano. The buildup of magma occurs when molten rock, gases, and other materials rise from the Earth's mantle to the crust, finding a pathway to the surface.
Therefore, the correct options for creating volcanoes are "plate tectonics" and "built up magma."