The law of conservation of matter states that matter can be neither created nor destroyed. It can, however, be recycled. Earth's crust is recycled by the interactions of
tectonic plates and convection in the mantle. Describe the role of plate tectonics in
the conservation of matter on Earth.

Please help!

where’s the list ? the question is incomplete

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

there are no contact forces mentioned on the list of choices that you've provided.