What are two ways to create a negative ion?
What are two ways to create a positive ion?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?