Fossils

Footprints and trails are examples of trace fossils.

• True

• False

Tags

NGSS.MS-LS4-1

Uplift may be caused by the Earth's plates colliding together and causing rocks to be pushed upward.

• True

• False

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

What is a fossil?

• any dead organism

• a perfect copy of a rock

• the remains, imprints, or traces of once-living organisms

• complex organisms that existed many centuries ago

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Which type of fossil preservation is a thin carbon outline of the original organism?

• cast     

• carbon film    

• mold

• petrified

A fossil formed when minerals replace all or part of an organism is called a

• mold   

• petrified fossil

• cast

• trace fossil

Which type of fossil can provide clues about the activities of ancient organisms?

• trace fossils

• remains preserved in amber

• carbon films

• molds and casts         

Tags

NGSS.MS-LS4-1

How do most fossils form?

• The hard parts of the organism dry out in the air until they harden.

• The soft parts of the organism change to stone.

• Living things die and their remains are buried by sediments.

• Freezing preserves the remains of an organism.

The relative age of a rock is

• its age compared to the ages of other rocks

• less than the age of the fossils the rock contains.

• the number of years since the rock formed.

• its age based on how much carbon-14 the rock contains.

Tags

NGSS.MS-ESS1-4

Radioactive decay occurs when atoms of an unstable element

• become part of a fossil.

• join with atoms of another element.

• break down to form atoms of another element.

• are exposed to chemical weathering.

Tags

NGSS.HS-PS1-8

When an isotope in the rock decays, a new _______________ is formed.

• proton

• element          

• organism

•  fossil