1.
Who proposed the idea of continental drift?
2.
What technology was used to map the ocean floor accurately?
3.
What part of Earth spreads apart at mid-ocean ridges?
4.
What underwater mountain chain forms at divergent boundaries?
5.
What material rises from beneath Earth’s crust at spreading centers?
6.
What type of plate boundary causes plates to move apart?
7.
What is the age of rock closest to a mid-ocean ridge?
8.
What material builds up in thicker layers farther from ridges?
9.
What property of rocks records Earth’s magnetic field?
10.
What is the switching of Earth’s magnetic poles called?
11.
What magnetic pattern is found on both sides of a mid-ocean ridge?
12.
What theory explains the movement of Earth’s plates?
