Show:
Fossils & Relative Dating of Fossils
Metamorphic Rocks & Radiometric Dating of Rocks
Geologic Time Scale
Seafloor Spreading & Wave Erosion and Deposition
Weathering & Erosion
100
This is 2 questions in 1. Get both of them right you get 200 points. Get one right 100 points. Get one wrong lose 100 points. This can be stealed. 1. What are fossils? 2. How old do fossils have to be to be considered fossils?
1. Fossils are the preserved remains of animals or plants. 2. Over 10,000 years old.
100
What are metamorphic rocks?
Metamorphic rocks are when heat and pressure change rocks. These are metamorphic rocks.
100
How much eras are there?
6 eras.
100
Where does seafloor spreading occur?
Seafloor spreading takes place at mid-ocean ridges.
100
What is erosion?
Erosion is when the soil, mud or sand is moved by wind, ice, or water.
200
What is relative age?
Relative age is the age of something relative to the age of something else.
200
What is radiometric dating?
Radiometric dating determines how old something is using radioactive isotopes.
200
______________ is 800 million years long.
Hadean.
200
How do waves cause erosion?
Waves can cause erosion over a short or long period of time. Waves breaking can cause erosion as they his the shoreline, or the salt in the water can break down rocks. Waves can also force water into the cracks of rocks or abrade the rocks by beating them with the small rocks that they carry.
200
What is weathering?
Weathering is the chemical or physical breakdown of rocks, soils, or minerals at Earth’s surface.
300
What are the types of fossils? Say their definition.
Body fossils are the preserved remains of a plant or animal's body. Trace fossils are the remains of the activity of an animal, such as preserved track ways, footprints, fossil sized eggshells, and nests.
300
Where do metamorphic rocks form?
Deep in the earth.
300
Name all the eras. Spell them.
Hadean, Archean, Cenozoic, Mesozoic, Proterozoic, and Paleozoic.
300
Explain why a ridge exists.
As tectonic plates move apart, magma fills it in and creates ridges.
300
What are the two types of weathering?
Mechanical weathering takes place when rocks are broken down without any change in the chemical nature of the rocks. Chemical weathering takes place in almost all types of rocks. Erosion is wearing away of rock.
400
What are the laws of relative dating? Name them only. *hint-there are 4 laws.*
The laws are law of superposition, law of original horizontality, law of cross-cutting, and law of lateral continuity.
400
What are metamorphic rocks classified by?
Texture and composition.
400
__________________ is 1,958,000,000 years long.
Proterozoic.
400
What is seafloor spreading?
Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart.
400
What is an example of chemical weathering?
There is many.
500
What are the steps of how a fossil is made?
Something dies. The body is washed into a river or lake. The body lies on the bottom of the ocean and the flesh rots away. The skeleton is buried under layers of mud and minerals seep into the bones. Later the sea level drops and the mud turn to rock.
500
Relative dating is used to determine the age of a fossils by looking at its _____________ ____ __________ of sedimetary rocks.
positions in layers
500
If Paleozoic is 261,000,000 million years long, and we have a scale using each centimeter as 7,500,000. How much centimeters long is Paleozoic?
34 or 34.8 centimeters
500
How do waves cause erosion and deposition?
Waves cause erosion and deposition by their movement. They move with so much force on the cost line which crashes the rocks. They are eroded and deposited on the shores.
500
Which comes first weathering or erosion? Explain.
Weathering....