What occurs in a oceanic to continental subduction zone?
The cooler, denser oceanic crust goes beneath the more buoyant, continental crust. The subducted oceanic crust partially melts, thus adding magma below the continental crust. Magma plumes then rise up and produce volcanoes on the continental crust.
What is the cosine of 60 degrees?
The answer is 1/2. Refer to a unit circle.
What is 2 multiplied by 3?
The answer is 6. Think of it as adding 2 to it's self 3 times: 2+2+2 = 6