3. What keeps Earth revolving around the sun? A. the force of gravity
B. the pull of the moon
C. the tilt of Earth's axis
D. the rotation of Earth

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves