Deep Earth Layers
If you were traveling to the center of the Earth, this innermost layer would be the final stop and the densest part of the planet.
What is the inner core?
Alfred Wegener used these three specific types of evidence—ranging from Mesosaurus remains to mountain ranges in Scotland—to propose his theory.
What are fossils, landforms, and climate evidence?
These types of rocks are categorized specifically by the physical and chemical "story" of how they were created.
What is how they form?
Without this primary ingredient—essentially crumbled and aged rock—soil wouldn't have a foundation.
What is weathered rock?
To stop the wind from literally blowing the profit off a flat field, a farmer might plant a row of trees known by this name.
What is a windbreak?
Unlike its solid neighbor, this layer remains a scorching liquid because the temperatures are high enough to overcome the surrounding pressure.
What is the outer core?
This rigid outer layer of the Earth isn't one solid shell; instead, it is cracked into the massive moving sections we call plates.
What is the lithosphere?
To turn any rock back into a "blank slate" in the rock cycle, it must undergo this process deep within the lithosphere.
What is melting (into magma)?
If you stumble upon a patch of soil that is very dark brown or black, it’s a sign that the soil is rich in this organic material.
What is humus?
Soil isn't just dirt; it gets its rock particles from the layer of solid rock sitting directly beneath it, known as this.
What is bedrock?
Even though it is incredibly hot, the inner core stays solid due to this intense physical factor.
What is extreme pressure?
When a dense oceanic plate collides with a lighter continental plate, this downward-sinking process occurs, recycling the crust back into the mantle.
What is subduction?
Before they can be cemented together, sedimentary rocks must go through this 5-step journey: Weathering, Erosion, and these three final steps.
What are deposition, compaction, and cementation?
Farmers often find that the chemistry and texture of their soil are most heavily influenced by this underlying "ancestor" rock.
What is parent rock (or bedrock)?
This is the process of moving weathered rock from one place to another, often via wind or water.
What is erosion?
Between the two types of crust, this one is "thinner but a winner" when it comes to density.
What is oceanic crust?
While the crust is where we live, most geologists agree that the "engine" moving the plates is located in the mantle via this heat-transfer process.
What are convection currents?
While some geological events tear things down, these are considered "constructive" because they create brand new land through cooling lava.
What are volcanoes?
If a farmer grows the exact same crop in the same spot for years, this is the most likely negative outcome for the land.
What is nutrient depletion?
In a soil fertility test, the "winner" is usually the sample that balances moisture, air space, and these life-sustaining chemicals.
What are nutrients?
This term describes a physical break in the Earth's crust where rocks slide past one another, often causing earthquakes.
What is a fault?
The massive Himalayan mountain range is the "sculpture" created by this specific type of plate interaction.
What is a continental-continental convergent boundary?
This is the specific term for the mechanical or chemical breakdown of "parent rock" into smaller bits of sediment.
What is weathering?
A soil's ability to support life (fertility) is often determined by its ability to do this with water after a heavy rain.
What is retain or hold water?
While "weathering" breaks it, and "erosion" moves it, this final step in the sedimentary process "drops" the rock in a new location.
What is deposition?