What are five landforms formed by river erosion

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

This is the substance(s) formed in a chemical reaction.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer