How can an intrusive landform become exposed to the air and visible?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm