Hydrogen .When acids touches all metal hydrogen gas is emitted .Strong acids is one that can produce a high concentration of hydrogen ions.Hope this helped!
D. all of the above
Hope this helps!
Gravity
The moon doesn't smash into the earth because the gravity from the earth keeps the moon in orbit around it.
A high electromagnetic wave has short, very fast, frequent waves.
a low electromagnetic wave has long, very slow, infrequent waves.
hope this helps! pls mark brainliest!
