ES08-2 DETERMINING THE AGE OF ROCK

Lava that hardens on the surface only

• intrusion
• extrusion
• unconformity
• absolute age

Magma that cools and pushes into the rock inside the Earth

• intrusion
• extrusion
• absolute age
• relative age

The age of rock given a a number of years

• intrusion
• extrusion
• relative age
• absolute age

What is the oldest layer?

• a
• b
• c
• d

Which is older, A or D?

• A
• D

States that rock layers on bottom are the oldest

• horizontality
• uniformitarianism
• superposition
• cross cutting

The age of rock compared to the ages of rock layers

• unconformity
• relative age
• absolute age
• extrusion

Which statement best describes the Law of Superposition?

• Each sedimentary layer of rock represents 1000 years of Earth's age, much like the rings of a tree.
• In undisturbed layers of sedimentary rock, the upper rock layers are older than the lower rock layers
• In undisturbed layers of sedimentary rock, the lowest layers contain the older rocks
• Rocks that form near volcanoes are older than surrounding rock.

Based on the Law of Superposition, what can be concluded about fossils?

• fossils give clues about past climate patterns
• Fossils form from the hard parts of organisms
• The oldest fossils are found in the lowest rock layers
• The most recent fossils were advanced organisms

Which can most likely be concluded about the top layer of rock seen in an undisturbed cliff wall?

• The top layer is older than layers located farther down the cliff.
• The top  layer is younger than layers located farther down the cliff.
• The top layer contains more fossils than layers located farther down the cliff.
• The top layer contains fewer fossils than layers located farther down the cliff.