Do Now You do not have to write the questions. Make a list of 5 people you know (mother, father, siblings, cousins, friends) and put them in order by age.

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Presentation transcript:

Do Now You do not have to write the questions. Make a list of 5 people you know (mother, father, siblings, cousins, friends) and put them in order by age from youngest to oldest.

Graphic Organizer Relative Age of Rocks

Vocabulary Foldable

1. Relative Dating

Do Now Discussion

Comparing the age of one rock to the ages of other rocks

2. Principle of Superposition

Youngest Middle Oldest The rock layers on the bottom are oldest and rock layers on the top are youngest.

3. Anticline

an arch of rock arranged in layers that bend downward in opposite directions from the top

Review

4. Faults

Is a break in Earth’s crust. It is always younger than the rock it cuts through.

Review

5. Intrusion

Magma that pushes into layers of rocks, then cools and hardens. It is always younger than the rock layers around and beneath it.

6. Extrusion

Lava that hardens on the surface. It is always younger than the rock layers beneath it.

6. Extrusion

Lava that hardens on the surface. It is always younger than the rock layers beneath it.

Independent Practice

Exit Ticket How do geologist use the principle of superposition to determine the relative age of rocks?

RELATIVE AGE OF ROCK LAYERS DAY 2

Do Now You do not have to write the questions. What is the principle of superposition? What is a fault?

Rock Layer Review

s2903page04.cfm

7. Law of Original Horizontality

States that rock layers are deposited in horizontal layers. If the rocks are tilted or folded, they have been deformed after deposition.

age01.cfm

8. Unconformity

Are gaps in the geologic record that show where some rock layers have been lost because of erosion

4-Step Unconformity Process Sedimentary rocks form in horizontal layers. Folding tilts the rock layers. The surface is eroded. New sediment is deposited, forming rock layers above the unconformity.

9. Index Fossils

Help geologist tell the relative ages of rocks and what the environment was like.

What can index fossils tell us about the environment? A fossil of a bird is found in layer E and a fossil of a fish is found in layer D. What happened? A dinosaur bone and a dragonfly fossil is found in layer C. What happened? A sea shell fossil is found layer B. What happened?

Cut Foldable

Independent Practice

Exit Ticket Describe the unconformity process. What do index fossils tell us about the environment?

ACT Prep Betty is shorter than Sally. Cynthia is taller than Sally. Carla is shorter than Betty. Is Sally shorter or taller than Carla?