Earthquakes
These plate boundaries form rifts, or cracks, form as the plates separate.
What are divergent plate boundaries?
Volcanoes can form on the ocean floor. True or False
What is true?
The boundary between two plates that move toward each other.
What are convergent boundaries?
Volcanoes and earthquakes occur along...
What are plate boundaries?
The water inside Crater Lake is known as a..
What is a caldera?
The numerical rating system that measures the energy, or magnitude of an earthquake.
What is the Richter Scale?
Long streams of molten rock from volcanoes are called
What are lava flows?
A crack or fracture line in Earth's lithosphere along which movement occurs.
What is a fault?
what is a dormant volcano?
A volcano that has not erupted for a long time but may erupt again
Molten earth material found above ground
Lava
Graph used to measure earthquakes.
What is a seismograph?
Molten rock stored below Earth's surface.
What is magma?
Small earthquakes that happen AFTER a larger one
Aftershocks
what is the Ring of Fire?
The rim of the Pacific Ocean, around which many violent volcanoes erupt
What are the first, fastest-moving waves to be detected from an earthquake?
P-waves
This number tells you the__________________ level of an earthquake.
What is magnitude?
what is an extinct volcano?
A volcano that can no longer erupt
How and why do earthquakes happen?
Tectonic plates are moving past each other and get stuck, building up pressure until they slip and an immense amount of energy is released
Most earthquakes occur in the center of continents. True or false.
What is false?
A large ocean wage generated by vertical motion of the seafloor during an earthquake.
What is a tsunami?
When rocks break because of stress, the energy released is in the form of an...
What is an earthquake?
Fast moving avalanches of hot gas, ash and rock.
What are pyroclastic flows?
Part of the Earth's surface directly over the hypocenter/focus?
What is the epicenter?
what is a shield volcano?
volcano built almost entirely of lava runoff/flow.
What type of wave caused by an earthquake can’t travel through liquid?
S-waves