Approximately how many plant and animal species have been identified?
A) 100,000 B) 1.75 million C) 3.4 million D) 13.6 million E) 111.7 million
Question 2
Molten rock beneath the Earth's surface is known as ________, whereas molten rock on the Earth's surface is called ________.
A) magma; lava
B) lava; extrusive
C) magma; intrusive
D) lava; magma
E) extrusive; intrusive
