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.

Do you think that nuclear fusion takes place in the atmospheres of stars? Why or why not?

What is the difference between relative time and absolute time?

Which of the following laws best define this statement? The total amount of energy in a closed system stays the same OA) Kepler's law OB) Avogadro's law OC) The law of negative energy D) The law of conservation of energy

Which of the following has the largest kinetic energy? A. a 10kg dog running down the street at 30mph B. a tightrope walker slowly crossing niagara falls C. a 0.02kg bullet moving down the barrel at 800mph D. a semi truck parked in a parking lot

The position of an electron is given by, with t in seconds and in meters. At t = 3.99 s, what are (a) the x-component, (b) the y-component, (c) the magnitude, and (d) the angle relative to the positive direction of the x axis, of the electron's

If 2 grams of element X combine with 4 grams of element Y to form compound XY, how many grams of element Y would combine with 46 grams of X to form the same compound?

How do positive and negative charges interact with each other?

What is electricity

What happens to the density as one progresses through the layers of the earth from the lithosphere toward the inner core

What is tiny holes on the surface of a plant?