Unit 10 Lesson 2

Question 1

Relative age of a fossil or rock

Answer 1

The age of that fossil or layer of rock compared to other fossils or rocks

Question 2

Fossil Record

Answer 2

Made up of all the fossils in Earth’s rock layers

Contains informstion about Earth’s history and the history of life on Earth

Question 3

Geologic time scale

Answer 3

Developed by scientists to divide Earth’s history into smalller units

Question 4

Index fossils

Answer 4

Help to identify a very short period
A.  The organisms lived only during a short period
B.  The organisms had large populations 
C.  The fossils are widespread 
D. The fossils are easily recognized

Question 5

Pangaea

Answer 5

Long ago, all of Earth’s land formed 1 giant continent

It broke up over millions of years

Question 6

Mass Extinctions

Answer 6

When many species became extinct at the same time in history

Caused by climate change, volcanic eruptions or objects from outer space

Question 7

Mesozoic Era

Answer 7

Middle or intermediate time

Unit of time that contains the Age of Dinosaurs

Trees that produce seeds in cones first appeared

Question 8

Ice Age

Answer 8

Known for the large numbers of animals such as saber-tooth cats that were able to live in a cold environment

Question 9

Paleozoic Era

Answer 9

Older or ancient time

Age of fishes

Question 10

Cenozoic Era

Answer 10

New or recent time

Question 11

Era

Answer 11

A large division of geologic time

Shorter than an eon