The___________ Forms the Relatively Cool, Brittle Tectonic Plates

Q17: During the history of Earth there have

Q18: Haley's Comet visits Earth's atmosphere once every

Q19: A_ is a well- tested and widely

Q20: The_ are the most prominent feature on

Q21: Comets are made up primarily of _.<br>A)

Q23: There are places on the deepest parts

Q24: A scientific_ is a tentative or untested

Q25: Examine the words and/or phrases below and

Q26: Earth Science uses_ .<br>A) biology<br>B) mathematics<br>C) chemistry<br>D)

Q27: What two chemical elements are most abundant