Chapter 11 plate tectonics Flashcards
moon “formation”
smaller planet “theia”, crashes into earth. merged but ejected much matter, eventually formed into moon.
Atmosphere formation
gases emitted from volcanos
ocean formation
water vapor from volcanoes condensed out of the atmosphere and gathered in low lying areas of the crust, making oceans.
“age” of the earth
4.6 billion years
relative age
the age of one thing compared to another without regard to how old either is
absolute age
age specified in years before the present
why is earths interior hot?
friction
asteroid bombardment
tidal forces
radioactivity
earths interior layers
Crust
>lithosphere
Lithospheric mantle
asthenosphere
>mantle
lower mantle
outer core
>core
inner core
Moho
the boundary that separates the crust from the lithospheric mantle
two crusts
continental: granite
Oceanic: Basalt
why is the lithosphere broken into plates
convection currents from the mantle move the plates
Pangea
super continent 300 million years ago
continental drift
theory by Alfred Wegner in 1912. Evidenced by matching rock types and glacial debris from different continents.
average speed of plates
speed of fingernail growth
plate bounderies
diverging (constructive)
converging (destructive)
transforming (conserving)
three hot spots
Hawaii
Iceland
Yellowstone national park
how is ushers video relevant to the quiz?
plate tectonics
how many lithospheric plates?
14
rifting
a place where continental crust is stretching and splitting
accreted terranes
a mass of crust that is transported by plate movement and fused onto the margin of a continent
anticline
a fold in the crust with an arc like ridge
syncline
a fold in the crust with a u shaped dip
