Gradual Earth Changes
What does changing gradually mean?
What does changing suddenly mean?
Changing quickly
Is a volcanic eruption reshaping the landscape due to the flow of lava a gradual or sudden change
sudden
What is a model?
A model is an idea of something that cannot be fully known or seen
What is the order of the layers of the Earth from the inside to the outside?
inner core, outer core, mantle (lower mantle, upper mantle), crust
Give an example of a gradual earth change.
weathering, erosion, deposition
Give an example of a sudden earth change
Earthquake, volcanic eruption, landslide, tsunami, etc.
Is an earthquake an example of a gradual or sudden change?
sudden
Why do we use models in science?
Models demonstrate an object or an idea that is difficult to picture in it's real form.
Which layer of the Earth is the thinnest?
The crust
What is weathering?
The breaking down of a material.
What causes an earthquake?
tectonic plates rubbing against one another
Is glacial erosion an example of a gradual or sudden change
gradual - erosion
Why might an object or idea be difficult to picture in its real form?
The object could be too big, too small, or too complicated to easily picture
What is the difference between the upper mantle and the lower mantle?
The upper mantle is solid.
The lower mantle is partially melted and able to flow slowly.
The taking away of broken down material.
Hot magma escapes through an opening in the crust
Is a river breaking down and carrying away sediment an example of a gradual or sudden change
gradual - weathering and erosion
Why do we use a model to demonstrate the Earth's interior?
We cannot see inside the Earth
The Earth is very large
Why is the inner core solid?
Because of the intense pressure of all the other layers pushing on it.
What is deposition?
Where the weathered, eroded material is left/dropped off.
How/why do landslides occur?
Following an event that disturbs part of the crust, causing it to break off and slide
Is the build up of rock/debris where a river meets a lake an example of a gradual or sudden change?
Gradual - deposition
What is an important tool that we have used to create a model for the interior of the Earth?
Seismology (p-wave and s-waves)
What layers of the Earth can P-waves travel through? Why?
All layers because P-waves can travel through all states of matter.
S-waves can only travel through solids, so they only travel through the crust and upper mantle. The liquid lower mantle, and outer core do not allow it to reach the solid inner core.