For each question, choose the sentence with the correct punctuation.
An earthquake can seem to happen , but it actually happens because pressure has been building up for some time.
A volcanic can be calm and quiet or sudden and violent
Tsunamis can be very , moving up to 500 miles per hour.
It would be interesting to read a(n) about Alfred Wegener
A mid-ocean ridge can form along a huge , or crack, in Earth’s crust.
Scientists make conclusions after examining evidence.