Gentle gravitational tidal forces appear to be necessary to ...

[ssal]

Gentle gravitational tidal forces appear to be necessary to create spiral arms.
 
  a. True
  b. False
  Indicate whether the statement is true or false

Question 2

Why are X-rays and gamma rays considered dangerous forms of light?
 
  a. These forms of light are only produced by large, dangerous machines.
  b. There is no form of protection from these forms of light.
 c. These forms of light break through Earth's atmosphere.
 d. Photons of these wavelengths have high energy.
 e. These forms of light cause sunburn.

[randomguy133]

Answer to Question 1

True

Answer to Question 2

d

[ssal]

Thank you!

[randomguy133]

Always glad to help...