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Quarter 2 Lesson #7 Formation of the Earth and Moon
Transcript of Quarter 2 Lesson #7 Formation of the Earth and Moon
The Formation of the Earth and Moon and Geologic Time
In a nutshell
By the end of this lesson SWBAT...
1) Describe when and how the Earth and Moon formed.
2) Describe how the Early Earth was different from today.
4.6 Billion Years Ago left over gas and dust from the formation of the Sun Accreted into the 8 Planets.
One of those planets, became what you know as Earth!
The early Earth was not even close to what you are familiar with.
Constant bombardment from meteors created a hot and fiery ball of lava!
Eventually, The surface settled and cooled.
There were so many volcanoes, the atmosphere was full of Carbon Dioxide,
During the Early Years on Earth, another planet of the early Solar System crashed into it not only adding to its size, but also creating the moon!
Eventually, Chemicals in the Oceans along with Energy from the Sun, created simple Organic Compounds
And these organic compounds became the early molecules of "Life"
However, it remained Extremely Volcanically Active
Also the water vapor they released rained down on the New Earth for thousands of years creating what we know as the Oceans
Early Organisms were simple single celled organisms.
Then Photosynthetic Organisms formed, creating Oxygen as a byproduct.
And over time, organisms evolved to become more complex.
And Billions of Years later, we end up with the world as you know it TODAY!
Eventually the Molten Lava Differentiated aka Separated into Layers based on Density
Please read sections "Earth forms, and Earth's Atmosphere evolves" on pages 366-367.
After reading it, please answer in complete sentences the following questions...
1) When and how did the Earth Form?
2) Why do scientist believe early Earth was bombarded by meteors?
3) Describe what Earth's original atmosphere was like, and how it became that way.
4) Describe how Earth's oceans formed. Where did the water come from?
5) When and How did the atmosphere accumulate oxygen?
The Earth was formed from matter that flew out of a rapidly spinning sun.
Prove me Wrong
Geologic Time Scale
Geologist, Paleontologists, and other Earth Scientists use fossil evidence to determine the age and ancient conditions of the Earth.
They Use 2 tools.
He reasoned that the positions of land and sea had changed over long periods of time.
In Ancient Greece, Aristotle saw that fossil seashells from rocks were similar to those found on the beach and inferred that the fossils were once part of living animals.
Modern Science has helped scientists realize that all elements decay into other elements at predictable rates.
Therefore, if we measure how much of an element is left over, we can predict how long ago it was made of all of the same element.
This is known as
Scientists have used evidence to divide Earth's History into
based on major events that changed the world during that time.
studies the layers of rock on Earth
Stratigraphy is based on 4 Assumptions:
Assumption #1: Original Horizontality
Assumption #2: Lateral Continuit
Assumption #3: Superposition
Assumption #4: Cross-cutting Relationships
Assumption #1: Assumes that sedimentary rocks form in flat horizontal layers.
This because sediments are deposited under water, they will fall flat on the bottom. Therefore If a sedimentary rock is found tilted, it can be determined that the layer was tilted after it was formed.
Assumption #2: Assumes that sedimentary rocks are deposited in continuous sheets.
Therefore when a valley cuts through sedimentary layers, it can be assumed that the rocks on either side of the valley were originally continuous.
Assumption #3: Assumes that sedimentary rocks can only be deposited one on top of another..
Therefore, the youngest layers are found at the top, and the oldest layers are found at the bottom of the sequence.
Assumption #4: Assumes that a rock formation or surface that cuts across other rock layers is younger than the rock layers it disturbs.
Therefore if an igneous rock cuts through a rock layer, then it must be younger than the rocks that it cuts through.
Using the 4 assumptions of relative dating, Scientists can get a general idea of how old a fossil is relative to another fossil, by determining the order the rocks they lie in formed.
How About this one? What do you think is the order from oldest to youngest? Which Assumptions support your theory?
Step 1: Original Layers
A, B, and C
Step 2: Intrusion of D
Step 3: Faulting of
Step 4: Erosion of lifted
Step 5: Top Soil Development