Earth's Layers & Formation
Early Earth's oceans were made of what material?
Magma/Lava
What is the name of the supercontinent that broke apart 200 million years ago?
Pangaea (Incorrect spelling is ok as long as it's close)
What period of time takes up the most of Earth's history?
Precambrian Era
What type of dating is a comparison of layers and NOT two family members having dinner together?
Relative Dating
True or False: Early Earth had very little oxygen in the atmosphere.
True
What type of plate boundary has tectonic plates moving away from each other?
Divergent Boundary
What percentage of Earth's History does Precambrian time take up?
90%
What type of dating gives an exact numerical age?
Absolute Dating
What layer of the Earth is responsible for movement of tectonic plates and is the layer where rocks begin to melt?
Asthenosphere
What is the process that causes the continents to spread apart?
Seafloor Spreading
During what three periods did the dinosaurs live?
Triassic, Jurassic, Cretaceous.
Based on Law of Superposition, where would you find the oldest layer of a rock sample?
On the bottom of the rock sample.
What property of matter caused the Earth's material to separate into different layers?
Density
What do we call the landmark on the seafloor that creates new crust?
Mid-Ocean Ridge or Mid-Atlantic Ridge
When did the Cambrian period begin? (Need a number of years ago)
542 Million Years Ago
If you have 400 grams of Parent Element to start, and your sample has gone through 2 half-lives, how much of the parent element will remain?
100 Grams
Put the Earth's layers in the correct order from Innermost to Outermost.
1. Inner Core
2. Outer Core
3. Mantle
4. Asthenosphere*
5. Crust
What are the 4 pieces of evidence for continental drift? (Here you only need to list them, but for the test you should understand them as well)
Fit of Coastlines, Fossil Distribution, Change of Climates, Similar Mountain Ranges/Rocks
Put these large units of time in order of increasing size: Period, Epoch, Era, Eon.
*Small* Epoch<Period<Era<Eon *Big*
If you have 12.5% of parent element remaining, how many half-lives has your sample gone through?
Three Half-lives