Dating our Earth

Fossils are the preserved remains or evidence of ancient living things. Which conditions aid in the formation of fossils?

• hard parts and rapid burial

• hard parts and slow burial

• soft parts and rapid burial

• soft parts and slow burial

Tags

NGSS.MS-LS4-1

Which type of fossil is this?

• preserved remains

• carbon film

• mold

• trace fossil

________ is the age of rocks and geologic features compared with other rocks and features nearby.

• unconformity

• inclusion

• absolute-age

• relative-age

Check all the boxes that are included in the Principles of Relative-Age Dating.

• Cross-cutting

• Original Horizontality

• Bottom Layer

• Superposition

• Inclusion

Cross-cutting occurs after layers of rock have already been formed and _________ cut through the rock that already exists.

Looking at the picture, which letter occured after letter B?

• A

• C

• D

• E

Explain how an unconformity is formed and how long the gap in rock record is.

For a fossil to be considered an index fossil three things must be true. Check the three correct details.

• inhabit only one location

• were abundant

• existed on Earth for a short length of time

• existed on Earth for a long length of time

• inhabit many locations

Absolute-age dating relies on the reliability of the rate of ________.

• elements of decay

• atoms of isotopes

• radioactive decay

• daughter decay

Atoms contain which three parts?

• nucleus

• cells

• proton

• neutron