Describe the reasons we do not see much early history of Earth on our planet and how we have been able to determine the history.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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

What sort of waves exhibit the doppler effect?