How do contour lines you visualize a feature of earth's solid surface

At what point the certain object feels zero garvitational force between earth and the moon. take the required information from the book.required: distance away from earth or moon

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle