Science 6 Grade Chapter 8 Lesson 1

Front 1

__________ is any naturally preserved evidence of life.

Back 1

A fossil

Front 2

_____________can be a footprint, an impression of a leaf, an animal’s burrow, or even an organism’s waste!

Back 2

A fossil

Front 3

Organisms with hard tissues, such as ____A____and ____B____, are more likely to be fossilized than organisms with only soft tissues.

Back 3

A. skeletons
B. shells

Front 4

organisms that live in _____A_____ have a better chance of being fossilized than organisms that live on ____B____.

Back 4

A. water
B. land

Front 5

It is _____ likely that an organism would be buried by sediment on land.

Back 5

less

Front 6

When an organism is not ___A____, scavengers easily can find its body and feed on it. What is left of the body undergoes ____B______.

Back 6

A. buried
B. weathering

Front 7

A third factor that determines whether an organism becomes fossilized is the amount of ______ in the environment.

Back 7

energy Example-organisms in a calm lake are more likely to fossilize than organisms in a fast-moving stream.

Front 8

Fast-moving water breaks up the remains of an _________.

Back 8

organism

Front 9

________ sediment is deposited in fast-moving water than in slow-moving water

Back 9

less

Front 10

The soft tissues of the organisms can be preserved as a thin carbon film between the layers of ________.

Back 10

shale

Front 11

Very fine details, such as the veins in a plant’s leaf, can still be seen in this kind of fossil.

Back 11

preserved as a thin carbon film between the layers of the shale

Front 12

_______ were animals that lived in oceans long ago.

Back 12

trilobites

Front 13

____ look alot like clams

Back 13

brachiopods

Front 14

______ are tiny protists that live in the oceans today.

Back 14

diatoms

Front 15

______ are relatives of the starfish.

Back 15

crinoids

Front 16

_________ are energy-rich resources that form from the buried remains of once-living organisms.

Back 16

fossil fuels

Front 17

The three kinds of fossil fuels are _______, ______ _____, and ____________.

Back 17

coal, natural gas, and petroleum.

Front 18

______A____ and _____B_______ formed mainly from the remains of organisms that once lived in the sea

Back 18

A. Petroleum
B. natural gas

Front 19

________ formed not from ocean organisms but from decayed swamp plants.

Back 19

Coal

Front 20

Since petroleum and natural gas form mainly from protists that lived in the oceans, these resources are found where ?

Back 20

oceans existed millions of years ago.

Front 21

On land, the country of Saudi Arabia has the largest known reserves of __________.

Back 21

petroleum

Front 22

Russia has the largest known reserves of _________.

Back 22

natural gas

Front 23

Coal deposits are found under the sites of ancient ________.

Back 23

swamps

Front 24

The United States has the largest _________ in the world.

Back 24

coal deposits

Front 25

______________ was once the most widely used fossil fuel.

Back 25

Coal

Front 26

Natural gas, which burns more cleanly, is often used in place of ____________.

Back 26

coal