Earth's History
Eon,Era,Period,Epoch
what are the units of geologic time scale in order
waves that travel along earth's surface.
what is a surface wave
convegent plate boundary
what type of boundary forms mountains
shield volcanoes are only explosive if water gets into the vent.
what type of volcano has explosive eruptions
normally a large concentration of faults. Some faults crack through Earth's surface because of stress of moving plates.
why do earthquakes happen at tectonic plate boundaries
Precambrian Period
When did the largest mass extinction in geologic history occur
the stable isotope
what is the daughter isotope
At compressional stress, fold mountains form. At shear stress, strike-slip form, atcompressional, volcanic mountains form.
what types of landform form from both types of stress
stratovolcanoes show inter-layering of lava flow and pryroclastic material.
what types of eruptions produce pryoclastic material
Point on Earth's surface directly above an earthquake's focus
epicenter
Paleozoic, Mesozoic, Cenozoic
The radioactive isotope
what is the parent isotope
folded mountains rock bend due to compressional stress. Fault block is when large pieces of rock break and move past each other horizontally.
difference between fold and fault-block mountains
Molten rock beneath the earth's surface
what is magma
distance, severity,population density, development, communication, etc.
what factors increase damage of earthquake
When time started and the earliest part of Earth's time
What is Precambrian Period
catastrophism
what is a principle that states all geologic events occurred suddenly
Ocean Ridges
what forms at divergent plate boundaries
what is lave
molten rock that has reached earth's surface.
weaker the further it is from the epicenter
how does strength of earthquake affect distance from epicenter
Geology
uniformitarianism
what is the principle that geologic processes that occurred in the past are still at work today
a type of fault where rocks on either side move past each other sideways with little up or down motion and they move past each other horizontally
how do faults move in strike-slip
Lava
what comes out during a none explosive eruption
by pushing and pulling the rock it moves just like sound waves push and pull the air.
how do p waves move through rocks