Africa has a large share in global air traffic.

A scientific model doesn't need to be something physical. It can also be mathematical

What forms of rocks are produced when rocks travel to fewer stages in the cycle?

Complete the sentence to describe what a wave is and what it does. A wave is a ___ that carries ___ from one place to another.

Which best describes the electromagnetic force? It is weaker than the gravitational force, with a greater range than the weak nuclear force. It is stronger than the gravitational force, with a greater range than the weak nuclear force.

One time-honored but slightly unpleasant way in which a hobbyist determines how much energy is left in a 9-V battery is to touch both of its terminals to his tongue briefly.

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0∘ above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground.

Design an experiment (Fair Test) to find out what would be a good insulator for a dog house.

Which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean? a. the amount of sunlight increases. b. the water temperature decreases. c. the amount of plants decreases. d.

Why do some elements have symbols that don't use letters in the element's name?

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.