Fossils Chapter 9 shared with deperestudent

Challenge: This is the largest unit of geologic time

One of the best preservers of remains

Challenge: The subdivision of an era

Challenge: Does radioactive dating show relative or absolute age?

The body of a large animal might be formed preserved in

What is the purpose of studying ice cores?

Which is an example of a gradual change on Earth?

Fossils are traces or remains of

Rock fossils form 

You find a fossil that is an imprint of a seashell. What type of fossil have you found?

A thick, oily liquid that preserves remains

The oldest layer in an undisturbed sedimentary bed is usually

What determines the divisions of the geologic time scale?

This is a reasonable conclusion based upon available evidence

What replaces plant cells in petrified wood?

Used to develop an accurate history of overall weather and rainfall patterns over time

A natural substance made from sticky resin that preserves remains

Part of the theory of uniformitarianism states that

A theory that states that Earth is always changing as it has in the past

What element can be left behind to form a visible layer in the rock?

How are index fossils useful to scientists?

An igneous intrusion that cuts through sedimentary layers is always

How do scientists know what dinosaurs looked like?

A fossil of an organism that was only common during specific time periods

Challenge: This term means "middle life"

A preserved footprint, trail, hole or feces from an animal.

Challenge: Which eon includes present day?

The original remains of a small insect may be found preserved in

Challenge: This term means "early life"

A tubular sample that shows layers of snow and ice that have built up over time

The width of rings in a tree cross-section indicates

Challenge: The division of an eon

Challenge: This term means "recent life"

The rate of the breakdown of radioactive material is measured in 

Two types of rock fossils are

Challenge: Name the era in which dinosaurs roamed the Earth

Age in relation to other events or objects

True of false: Sedimentary rocks can provide absolute age

Challenge: Precambrian time refers to

The actual age of an event or object

The time it takes for half of a radioactive element to change to another form

The soft parts of an organism often decay very quickly. The result is that many fossils

This divides the Earth's history by major events or changes

This fossil shows details of soft parts of animals and plants

By studying layers of sedimentary rock, scientists can determine the

The stone fossil of a tree

Which statement best describes how Earth changes over time?

A fossil of a dinosaur's footprint is an example of 

This fossil is the solid 3D model of an organism

Forms from cooled molten material