Internal Structure
What is the inner core
This layer is the center of the Earth, made mainly of iron and nickel, with temperatures up to 6,000°C
What is weathering?
This process shapes the Earth's surface through the breakdown of rocks.
What is radiometric dating?
This technique uses radioactive decay to determine the age of rocks.
What percentage of Earth's atmosphere is oxygen?
21% of the Earth's atmosphere is composed of oxygen
What is the outer core?
This liquid layer creates Earth's magnetic field1.
What are craters?
These depressions on planetary surfaces are formed by impacts.
What is the law of superposition?
This principle states that younger rock layers are deposited on top of older layers.
Where is the ozone layer located?
The ozone layer is located in the stratosphere
What is the mantle?
This layer makes up about 80% of Earth's volume and is partially melted at greater depths 45.
What are igneous rocks?
This type of rock forms from the cooling of magma or lava.
What are fossils?
These are preserved remains or traces of ancient life.
Which two planets take less time to orbit the sun than Earth?
Mercury and Venus
What is the moho?
This boundary between the crust and mantle was the first major change discovered in Earth's structure2.
What is erosion?
This process involves the movement of weathered rock material.
What is the geologic time scale?
This term refers to the sequence of rock layers and the fossils they contain.
What causes the Greenhouse Effect?
The Greenhouse Effect is caused by absorbing outgoing long wave radiation from the Earth
whats the crust
This layer has an average thickness of 15-20 km and forms the solid, rocky surface of the Earth
What are glaciers?
These are large masses of ice that move slowly over land.
What is plate tectonics?
This theory explains the large-scale motions of Earth's lithosphere.
What is the partly melted rock layer on which tectonic plates move?
The asthenosphere is the partly melted rock layer on which plates move