8th grade science

Question 1

Carbon film

Answer 1

thin film of carbon left from an organism and preserved as a fossil

Question 2

Cast

Answer 2

body fossil that forms when a mold fills with sediments or minerals and then hardens into rock

Question 3

Fossil

Answer 3

the remains, imprints, or traces of animals or plants that died long ago

Question 4

Index fossil

Answer 4

the remains of species that live for a short time, were numerous, and were found in many places

Question 5

Mold

Answer 5

body fossil that forms when an organism decays or dissolves and leaves a cavity in the rock

Question 6

Permineralized remains

Answer 6

fossils in which the spaces are filled with minerals from groundwater

Question 7

Principle of superposition

Answer 7

states that in undisturbed rock layers, the oldest rock is at the bottom and the rocks become younger and younger toward the top

Question 8

Relative age

Answer 8

age of something compared to the age of other things

Question 9

Unconformity

Answer 9

A gap in the rock layers due to erosion or a period without rock deposit