Along the northwestern coast of the united states, the juan de fuca plate is being pushed underneath the north american plate, causing magma to rise to the surface. magma that reaches the surface and cools will often a. erode a wide valley over time. b. build up a mountain over time. c. burn away a steep canyon. d. cause a new tectonic plate to form.

Along the northwestern coast of the United States, the Juan de Fuca Plate is being pushed underneath the North American Plate, causing magma to rise to the surface. Magma that reaches the surface and cools will often build up a mountain over time.

Explanation The Juan de Fuca plate is being pushed underneath the North American Plate. Causing magma to rise to the surface. Magma that reaches the surface and cools will form a mountain

Magma is mostly found in a huge underground pockets. Magma that reaches the surface of the earth is referred to as lava, when it cools and hardens, it forms igneous rock. Temperatures hot enough to melt rocks are usually found only deep inside the earth.

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