Which of the following is not a chemical that can be created by chemists?

O

A. Plastic

O

B. Helium

O

C. Sodium

O

D. Gasoline

The apparent shapes of the moon in the sky are called its

What is the name of the fine soil particles deposited by rivers?

What elements are stars mostly made of? How do we know this?

What type of reaction occurs in the cores of stars to create their tremendous amounts of energy? a. fusion b. fission c. physical d. chemical

What type of waves can travel through a medium

What kind of movement does the heat within the core and mantle directly generate?

Explain why Newton's first law of motion can be difficult to observe in moving objects?

No force is necessary to

A boat has a mass of 4040 kg. Its engines generate a drive force of 4660 N due west, while the wind exerts a force of 880 N due east and the water exerts a resistive force of 1400 N due east. Take west to be the positive direction.

Define the word projectile