What term refers to the envelope of mixed gases confined close to a planet's surface by the force of gravity?

a. atmosphere

b. core

c. crust

d. mantle

The variable that you change during an experiment is called what type of variable?

What color is lightning

Explain why the angle is important when lauching projectiles

Design a solution that can monitor and minimize the melting of sea ice caused by human activity

Which type of electromagnetic radiation cannot be focused?

Which type of wave experiences a change in speed when entering a new medium? a) only sound waves b) both sound and light waves c) only light waves d) neither sound or light waves

Three basic classes of collisions include all but which of the following?

How does the use of biomass energy to create electricity harm the environment

Which physical property of iron made it popular for use in weapons? 1. Magnetism 2. Luster 3. Malleability 4. Ductility

a 2 kg rock is dropped from the top of a 30 m High building calculate the ball at the time that it strikes the ground