Earth Systems
This sphere of earth is made up of all living matter.
What is the Biosphere?
These are the two forms of weathering.
What are chemical and physical?
Gradient, load, and discharge all affect a stream's ability to do this.
What is cause erosion?
These are trace remains of organisms that lived long ago.
What are fossils?
This is how old the earth is.
What is around 4.6 billions years old?
The atmosphere contains this percent of oxygen (the rest is mostly nitrogen).
What is 21%?
This is the name for the chemical interaction of air with other compounds (materials).
What is oxidation?
Canyons and valleys are landforms caused by this process.
What is erosion?
This is the name for the single landmass formed by the continents about 200 million years ago.
What is Pangaea?
This method uses rock layers to determine which are older and younger.
What is relative dating?
The core of the earth is made up of these two metals.
What are iron and nickel.
Acid is found in these sources (name two out of three).
What are precipitation, groundwater, and living things?
Floodplains and deltas are land forms caused by this process.
What is deposition?
What landform is taller and more jagged when it is young?
What are mountains?
Absolute dating measures the half-life of this kind of material to determine age.
What is radioactive?
These two spheres contain both the solid and liquid forms of water.
What is water (ice)?
These large masses of moving ice are a cause of erosion and deposition.
What are glaciers?
This happened about 65 millions years ago, and is believed to have wiped out the dinosaurs.
What is a giant asteroid hitting earth?
Radiometric dating has been done on these to determine the age of Earth.
This is important to know about the five spheres of earth.
What is that they are constantly interacting with each other?
Wind, water, and gravity are examples of these.
What is physical weathering?
Sand dunes are formed by this cause of erosion.
What is wind?
This is the process of wood or bone becoming rock.
What is petrification?
Catastrophism and Uniformitarianism are both explanations for how this has occurred on earth.
What is change?