(ET)FOSSILS TOPIC 7 LESSON 1

MOLD FOSSIL-A fossil formed when sediment fills the inside or covers the outside of a dead organism.

CAST FOSSIL- A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast

TRACE FOSSIL-Trace fossils are formed when an organism lays an egg or makes a mark in mud or sand

Amber- is the common name for fossil resin

You are on vacation and visiting an area where dinosaurs once lived. You find a fossil dinosaur nest that looks like the fossil in the picture. A fossil can give information about the living thing that left the fossil.

What kind of fossil is shown in the picture?

• mold fossil

• cast fossil

• trace fossil

• amber

Tags

NGSS.MS-LS4-1

Study the fossil for evidence about the once-living organism that left it. Choose two things you learned about the organism by studying the fossil nest.

• The nest was left by an animal because plants do not lay eggs.

• The animal probably lived on land and built its nest on the ground because all the eggs are together.

• The animal probably lived on land and built its nest in a tree because all the eggs are together.

• The animal made its nest in the water because all the eggs are together.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

The process of fossil formation has several steps and takes millions of years. These are the steps of a mouse becomes a fossil.

Select the step that comes first.

• Minerals in water move into the space that once held the mouse's body.

• The body of the dead mouse is covered with soil.

• A mouse dies.

• Water flows through the soil and dissolves the body of the mouse, leaving an empty space called a mold.

• Minerals harden to form a cast. Over time, the cast becomes a rocky fossil.

The process of fossil formation has several steps and takes millions of years. These are the steps of a mouse becomes a fossil.

Select the step that comes second.

• Minerals in water move into the space that once held the mouse's body.

• The body of the dead mouse is covered with soil.

• A mouse dies.

• Water flows through the soil and dissolves the body of the mouse, leaving an empty space called a mold.

• Minerals harden to form a cast. Over time, the cast becomes a rocky fossil.

The process of fossil formation has several steps and takes millions of years. These are the steps of a mouse becomes a fossil.

Select the step that comes third.

• Minerals in water move into the space that once held the mouse's body.

• The body of the dead mouse is covered with soil.

• A mouse dies.

• Water flows through the soil and dissolves the body of the mouse, leaving an empty space called a mold.

• Minerals harden to form a cast. Over time, the cast becomes a rocky fossil.

The process of fossil formation has several steps and takes millions of years. These are the steps of a mouse becomes a fossil.

Select the step that comes fourth.

• Minerals in water move into the space that once held the mouse's body.

• The body of the dead mouse is covered with soil.

• A mouse dies.

• Water flows through the soil and dissolves the body of the mouse, leaving an empty space called a mold.

• Minerals harden to form a cast. Over time, the cast becomes a rocky fossil.

The process of fossil formation has several steps and takes millions of years. These are the steps of a mouse becomes a fossil.

Select the step that comes fifth.

• Minerals in water move into the space that once held the mouse's body.

• The body of the dead mouse is covered with soil.

• A mouse dies.

• Water flows through the soil and dissolves the body of the mouse, leaving an empty space called a mold.

• Minerals harden to form a cast. Over time, the cast becomes a rocky fossil.

Ashley created a list of facts from her study of fossils.

• Thousands of years ago, a spider crawled along a sticky tree trunk that was growing on the banks of a river.

• Many fish swam in the river.

• The spider and fish died and became fossils after millions of years.

Based on her list, select the correct word to complete the sentence.

The kind of fossil the spider is most likely to form is a (cast fossil / fossil in amber).

• cast fossil

• fossil in amber

Ashley created a list of facts from her study of fossils.

• Thousands of years ago, a spider crawled along a sticky tree trunk that was growing on the banks of a river.

• Many fish swam in the river.

• The spider and fish died and became fossils after millions of years.

Based on her list, select the correct word to complete the sentence.

The kind of fossil the fish is most likely to form is a (fossil in amber / cast fossil).

• cast fossil

• fossil in amber

Choose two correct statements about the picture.

• The shell is a fossil mold.

• The shell is a trace fossil.

• The fossil was made when a shelled animal became trapped in sap.

• The fossil tells scientists that this kind of shelled animal once existed.

Tags

NGSS.MS-LS4-1