An Aquifer Is

Q6: The most common volcanic rock is<br>A) pumice.<br>B)

Q10: The earth's crust<br>A) has an approximately constant

Q12: Each step of 1 on the Richter

Q22: The clay minerals occur in the form

Q39: Coral reefs are composed of<br>A) granite.<br>B) shale.<br>C)

Q42: Volcanic gases do not include<br>A) hydrogen.<br>B) carbon

Q43: Most crustal rocks<br>A)were formed from compacted sediments.<br>B)were

Q45: Mica is present in<br>A)marble.<br>B)chert.<br>C)basalt.<br>D)gneiss.

Q46: Rivers produce which one or more of

Q49: Most earthquakes are caused by shifts of