The atoms that make up a star can be determined by a. the color
b. the position of the star in its galaxy
c. the stars emission spectrum
d. the star corona

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

The ozone hole appears in antarctica during

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?