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Relative Dating
How Old is It?
Epic Eras
The Rock Cycle
Vocabulary
100
In the picture below, which one is the youngest layer?

Limestone.
100
How old is the Earth?
4.6 billion years old
100
The geologic time scale is divided into this many eras.
Four
100

These rocks form when molten rock cools and hardens

igneous

100
What is the supercontinent below called?

Pangaea
200
In this picture, it's most likely the part that formed last.

B/The stream
200
How old is the first life on Earth?
3.5 billion years old
200
What era are we currently living in?
Cenozoic
200

This is needed to turn a sedimentary rock into a metamorphic rock.

heat and pressure

200

When magma cuts through rock but stays below the surface. 

Intrusion

300
In this picture, it's what letter E is.

Fault line/cross-cutting relationship
300

The age of a fossil in comparison to another. 

Relative age or relative dating

300

It's the longest era...it's about 4 billion years long!

Pre-cambrian

300

This is what an igneous rock becomes after weathering and erosion.

Sediments

300
The time it takes for half of a radioactive substance to decay.
Half-life.
400
What came first, the insect or the amber?

The insect.
400

It's the type of dating used to determine exactly  how old a fossil is.

Absolute dating or Radioactive dating or Carbon dating

400
Dinosaurs roamed the Earth during this era.
Mesozoic
400

Igneous rocks can be found in or around these

a volcano
400
It's the law that tells you that the oldest rock layer is at the bottom and the youngest rock layer is at the top.
Superposition
500
In this picture, it's what comes after W.

E
500

How old is the fossil if it only has 1/4 of its carbon-14 remaining?

11,400 years old

500
An "explosion of variety of life" occurred during this era.
Paleozoic
500

A rock that was sediment, then went under pressure, then was melted down and crystalized or cooled inside a volcano is this type of rock. 

igneous

500

One of the index fossils we have learned about. Its an organism with a three-lobed exoskeleton that was abundant in Paleozoic oceans.

trilobite