Unit 7 Test Geotime Johnson

In what type of rocks would geologists most likely find evidence of past life forms?

• igneous rocks

• metamorphic rocks

• sedimentary rocks

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS2-3

The present is the key to the past. This statement rephrases the ____.

• principle of cross-cutting relationships

• principle of uniformitarianism

• principle of original horizontality

According to the principle of cross-cutting relationships, an intrusive rock body is ____.

• deposited as sedimentary layers

• older than the rocks into which it intrudes

• younger than the rocks into which it intrudes

The dating process that places geologic events in proper sequence is referred to as a ____.

• radiometric dating

• relative dating

• numerical dating

In general, the law of superposition states that in an undeformed sequence of sedimentary rocks, each layer is ____.

• basically the same age

• older than the one above it

• older than the one below it

Tags

NGSS.MS-ESS1-4

An unconformity is a(n) ____.

• layer of sedimentary rocks

• gap in the rock record (mother Earth pauses)

• layer of rocks with unusual fossils

Which of the following is important if an organism is to become a fossil?

• rapid burial and hard parts

• rapid burial and soft parts

• slow burial and hard parts

The task of using fossils to match up rocks of similar ages in different areas is called ____.

• succession

• correlation

• fossilization

Index fossils allow geologists to ____.

• match rocks of the same age in different regions

• determine the exact age of rocks

• determine why some organisms became extinct

The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called ____.

• the daughter product

• geologic time

• the half-life

Tags

NGSS.HS-PS1-8