Geological Time
Era of Mammals
Cenozoic
Which layer is the thinnest?
The crust is the thinnest layer.
What is a mid-ocean ridge?
an underwater mountain system formed by plate tectonics
What boundary leads to frequent earthquakes
convergent boundarys
How are metamorphic rocks made?
from existing igneous, sedimentary, or other metamorphic rocks
Era of Reptiles
Mesozoic
Which layer is the thickest?
The mantle is the thickest layer.
What forms/occurs at a transform boundary?
earthquakes
What is the scale they use for earthquakes
Which type of rock is most likely to have fossils?
Sedimentary rocks
When did the mass extinction of dinosaurs happen
Cretaceous Period
Which layer is liquid?
Outercore
What forms/occurs at a divergent boundary?
oceanic-oceanic
continental-continetal
how are volcanoes formed
Volcanoes are formed when molten rock is pushed from the Earth's mantle to the surface.
What are the three types of rocks
igenoas, sendimentary, and metaophoric
What are the units of time oldest to most recent?
Age, Era, Periods, Epoch, Age
Four Main Layers of the Earth
crust, mantle, outer core, and inner core
What three pieces of evidence led to the continental drift theory?
Rock formation, fossil evidence, and climate evidence
What is the dangerous part of a volcano
volcanic ash
How do igneous rocks form?
Approximately how old is our fossil record
3.5 billion years
How are the Earth's layers determined?
Scientists use seismic waves to determine the Earth's layers.
How are islands made
From hotspots
how are volcanoes formed
shield-small eruptions
super-global impacts
composit- small volcanoes
sindercone-classic volcanoes
Limestone is a type of ______ Rock
Sedimentary Rock