Waves that do not require a medium through which to travel are

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer