Download 4.1 Reinforcing Key Concepts

SECTION
EARTH’S PAST IS REVEALED IN ROCKS AND FOSSILS.
4.1 Reinforcing Key Concepts
BIG IDEA Rocks,
KEY CONCEPT
fossils, and other types of natural evidence tell Earth’s story.
Earth’s past is revealed in rocks and fossils.
1. Rocks, fossils, and original remains give clues about the past. Fossils
formed in
sedimentary rock show us some of the organisms that lived long ago. Read each sentence
about fossils and their formation. Fill in the correct answer on the line.
a. Remains
of mammoths have been preserved in ____________.
____________ may form when an animal becomes buried in
sediment and then decays away.
b. A
c. ____________
is the stone fossil of a tree.
____________ is a type of fossil found in rock that may show
detailed images even of the soft parts of plants and animals.
d. A
e. Original
remains of insects may be found in hardened tree resin call
____________.
f. The
original remains of ancient animals such as sabertooth cats have
g. Sand
h. A
or sediment can harden in a mold to create a ____________.
fossilized footprint, trail, or animal hole is called a ____________.
2. Fossils and other natural evidence show changes in life and the environment. Ice
cores and tree rings, shown below, both provide evidence about life in the past. In what other
ways are they alike?
CHAPTER 4
Views of Earth’s Past
Copyright © by McDougal Littell, a division of Houghton Mifflin Company
been preserved in ____________.
In what ways are ice cores and tree rings different?
THE CHANGING EARTH, CHAPTER 4, REINFORCING KEY CONCEPTS 213
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