Why is the force of gravity less on the moon than on Earth

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?

How does the formation of intrusive and extrusive igneous rocks differ?