tectonic waves
what is a seismic wave?
a release of energy through rocks.
What is an earthquake?
the shaking of Earth's crust.
What is a volcano?
the opening in Earth's crust.
what is a plate boundary?
Where two plates meet.
What unit of measurement does 100 represent in a geologic time scale?
Millions of years ago.
Which wave is faster p or s?
P waves
Are aftershocks smaller or larger than the actual earthquake?
Smaller.
What do volcanoes erupt? (hint: its 3 things)
Molten Rock, ash, and gasses
Where do plates pull apart?
At a divergent boundary.
Why do scientist not use years to describe earth's age?
Because it would be to complicated.
Can a s-wave travel thru liquids?
NO
DO earthquakes happen because tectonic plates move?
Yes
Where is the ring of fire?
A high activity zone that is around the Pacific Ocean.
What is subduction?
Where one plate slides under another.
What does Ma stand for?
Mega-annum or millions of years ago.
How are P waves and S waves different?
S waves move up and down while P waves move by expanding.
What is an epicenter?
The surface point above the focus.
What is the shape of the ring of fire?
Horseshoe-shaped.
why does subduction happen at convergent boundaries?
Because one plate is denser and sinks under the other.
If you see the number 200 on a geologic chart what does it actually represent?
200 million years.
Can p waves pass through Earth's outer core?
Yes because the outer core is liquid and p waves can travel through liquid.
How do aftershocks occur?
tectonic plates settling after a shift.
What is the main cause of volcanic activity?
The movement of tectonic plates.
What is a surface feature formed at a subduction zone?
A deep ocean trench or a volcanic.
If a Rock is dated 500 Ma how many years ago did it form?
500,000,000 years ago.