What is a medium and why do waves travel through them?

Modern telescopes are capable of seeing bright galaxies up to about

The trans-Atlantic telegraph joined England and the United States by wire. a. True b. False

You check a barometer and observe that the air pressure has been dropping all day. Is tonight's weather more likely to be calm or stormy?

What is the effect on the volume of a rectangular prism if the width is doubled and the hight is reduced to half of the original height? A) the volume is doubled. B) the volume is halved. C) the volume is tripled. D) the volume is unchanged.

How do good and bad ozone forms

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil