L4 PS Homework

What is the fourth state of matter, characterized by particles that have been ionized?

• Solid

• Liquid

• Gas

• Plasma

Approximately what percentage of the visible universe is composed of plasma?

• 10%

• 50%

• 75%

• 99.9%

What phenomenon occurs when magnetic field lines become tangled, then explosively snap and realign, transferring energy and sending plasma particles flying?

• Solar flare

• Magnetic reconnection

• Aurora borealis

• Supernova explosion