9.energy moves through waves in an ? .
b. circular motion
c. straight line.

10 what is the vertical distance between a though and crest
a. wave height
c. wave speed
d. wave period

Why do lunar and solar eclipse not happen every month

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.

Which particles make up the nucleus of an atom? a. protons and electrons b. neutrons and electrons c. protons only d. protons and neutrons e. neutrons only