When drawing a free-body diagram for an object on an inclined surface, which way does the normal force point?
A. Straight down
B. Perpendicular to the surface
C. Parallel to the surface
D. Straight up

Explanation:

the answer is B normal force is always perpendicular to the surface

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods