Warm-up 10/20 Describe what you think Earth was like just after it formed.

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Presentation transcript:

Warm-up 10/20 Describe what you think Earth was like just after it formed.

Early History of Earth Formation 4.6 billion years ago (bya) Nebular Theory Molten Volcanoes Collisions Atmosphere CO 2 Biological influence Pink in color Gradually cooled 3.9 bya oceans form Water from comets, planet Condensation led to rain Runoff brings minerals

Warm-up 10/21-22 Approximately how old is Earth? How do you think scientists determined that age?

Relative Dating Determining the relative order of past events. Estimate of age based on position ◦ Ryan Gosling was born after Matt McConaughey. Three ‘rules’

What order did the baker put down these layers of the cake? Purple! Blue! Yellow Red! Dark Pink! Light Pink! White!

#1: Law of Superposition (LOS) Bottom layer = Top layer = Placed last Placed first *When rocks are horizontal!

What happens if rock layers are not horizontal?

Layers deposited horizontally Rock is folded after cooling - Caused by pressure Bottom is still oldest. Top is still youngest. OLDEST YOUNGEST 2. Principle of Horizontality

Practice: Hold up the number Which is the oldest? Which layer is the youngest?

What happens if the rock layers are faulted?

1. A fault is younger than any rock layer it cuts through. OLDEST 2 ND OLDEST 3 RD OLDEST YOUNGEST 3. Principle of Cross-Cutting Relationships

2. An intrusion is younger than the rock layers it pushes through. OLDEST 2 ND OLDEST INTRUSION = YOUNGEST Intrusion – magma forces its way through the rock layers.

Practice!

Practice!

Tell the rock’s story…