Rock Layers Geologic Time

Fossils are most commonly found in _________ rocks: Igneous Metamorphic Sedimentary Volcanic.

• Igneous

• Metamorphic

• Sedimentary

• Volcanic

Geologists use the geologic time scale to understand:

• Earth's future

• Earth's history

• Earth's present

• Earth's core

Tags

NGSS.MS-ESS1-4

The layers in the canyon's sedimentary rock were most likely created by ​​ (a)  

• moving water

• volcanic eruptions

• earthquakes

• scorching sun

Answer explanation

Canyon layers are exposed by rivers carving into the rock.

Tags

NGSS.MS-ESS2-2

Which fossil would make the best index fossil?

• Beetle

• Flower

• Frog

• Fish

Tags

NGSS.MS-LS4-1

If a student used the analogy of her stacking books in her locker, which law of relative dating is she referring to?

• Law of Superposition

• Law of Crosscutting

• Law of Inclusions

• Law of Inertia

Which statement is incorrect about the Geologic Time Scale?

• Life was not present when the Earth was still cooling.

• Prokaryotes showed up on Earth long before reptiles and small plants.

• Modern humans arrived later than reptiles and small plants.

• Dinosaurs showed up just after the Earth was created.

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Geologists use two main ways to find the age of rocks. When they want an age in actual years, they find the ​ (a)   . This involves looking at the radioactive decay of specific isotopes. The rate of decay is called the ​ (b)   of the isotope, or the time it takes for half of the isotope to decay to a daughter product. Sometimes, geologists will also use ​ (c)   to represent a specific period of time to help them find an age. When geologists use a sequence of layers to find an age they are finding the ​ (d)   of the layer. This is done by the ​ (e)   , where it is assumed the topmost layer is the youngest and the bottom-most layer is the oldest.

• absolute age

• half-life

• fossils

• relative age

• rule of superposition

Tags

NGSS.MS-ESS1-4

The Law of ​ (a)   states that any feature that cuts across a sequence of rocks, is younger than everything it cuts.

• Crosscutting

• Superposition

• Inclusion

Order the divisions of geologic time from the longest to the shortest.

• eras, eons, periods

• periods, eras, eons

• periods, eons, eras

• 1. eons, eras, periods

Which type of rock is most likely to contain fossils?

• Igneous

• Metamorphic

• Sedimentary

• Volcanic

Tags

NGSS.MS-LS4-1