Earth 16 Items

Question 0

Mantle

Answer 0

middle layer of the Earth

Question 1

Core

Answer 1

innermost layer of the Earth

Question 2

Crust

Answer 2

outermost, thinnest, and most solid layer of the Earth

Question 3

Theory

Answer 3

idea used to explain observed facts

Question 4

Geologic Time Scale

Answer 4

units of time that divide the Earth’s history

Question 5

Index fossil

Answer 5

fossil used to determine the age of rocks

Question 6

Extinct

Answer 6

no longer existing on the Earth

Question 7

Fossil

Answer 7

the preserved remains of an ancient plant or animal

Question 8

Continental Drift Theory

Answer 8

theory that continents were a single mass that broke up and drifted to present positions

Question 9

Plate Tectonics Theory

Answer 9

theory that crust of the Earth is made up of sections, called plates, that are in motion

Question 10

Sea-floor spreading

Answer 10

process by which new sea floor forms as tectonic plates move

Question 11

Faults

Answer 11

cracks in Earth’s crust where blocks of rock have moved

Question 12

Epicenter

Answer 12

point on Earth’s surface that is directly above the focus of an earthquake

Question 13

Convergent boundary

Answer 13

a place where the Earth’s plates come together

Question 14

Divergent boundary

Answer 14

a place where the Earth’s plates separate

Question 15

Seismograph

Answer 15

instrument used to measure and record earthquake waves