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.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

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