Day and night are caused by

a. the tilt of Earth's axis.

b. Earth's revolution around the sun.

c. eclipses.

d. Earth's rotation on its axis.

Which element in the earth's atmosphere is essential for human life, is extremely rare or nonexistent in the atmospheres of other planets in our solar system, and is primarily responsible for the development of life outside the oceans?

When perspiration on the human body absorbs heat, some of the perspiration turns into water vapor?

Which microscope uses visible light? Which microscope uses visible light? differential interference contrast microscope scanning acoustic microscope fluorescence microscope transmission electron microscope

Sound is ... A. matter B. Vibration C. potential energy D. electromagnetic energy

A disk with moment of inertia I relative to a vertical axis through its center is dropped onto another disk with moment of inertia equal to 2I which is rotating with angular velocity. Find the final angular velocity in terms of.

Acceleration increases over time once a force is applied to the object. Given a force of 10.0 Newtons, which mass will have the greatest acceleration?

The transfer of energy between two objects by electromagnetic waves is called

What is the unit of k (spring constant) in SI system?

The teacher prepares 2.50 liters (L) of a salt solution for a class experiment. How many quarts (qt) are in 2.50 L? (1 quart = 0.943 liters)

What is a scavenger give some examples