Earth's Layers
The thickest of the compositional layers
Mantle
There are ____ major tectonic plates
9
Can tell you close to the exact age of a rock, fossil, or event
Absolute dating
What are the 3 types of rocks?
metamorphic, igneous, and sedimentary
Process by which land becomes more desertlike and unable to support life.
desertification
The reason the inner core is a solid
Too much pressure keeps molecules from flowing like a liquid.
The 3 types of plate boundaries are....
Transform, Convergent, and Divergent
Tells you the age of a rock layer in comparison to the layers around it.
Relative dating
This type of rock forms under heat and pressure
metamorphic
The removal of trees and other vegetation from an area
deforestation
The 2 physical/mechanical layers that make up the mantle
asthenosphere and mesosphere
Plates at this type of boundary move horizontally past each other
Transform
In a geological column a fault is always__________ than the layers it runs through
younger
These main processes form igneous rock
melting and cooling
process by which human activity and natural processes damage land to a point where it can no longer support ecosystem
land degradation
The process in the mantle that brings down rock into the Earth and carries rock up to the surface
Convection
These form at divergent boundaries on the ocean floor
Mid-ocean ridges
What is a half-life?
time it takes for half of a radioactive material sample to decay.
Sedimentary rocks are made when _______________ is _____________ and _______________
sediment, compacted, cemented
formation and growth of cities
urbanization
List the physical/mechanical layers of the Earth from least to most dense
Lithosphere, asthenosphere, mesosphere, outer core, inner core
What are the 3 types of convergent boundaries?
cont-cont, cont-ocean, and ocean-ocean
What percent of parent isotope would be remaining after 30,000 years if the half-life is 10,000years?
12.5%
The process that changes rock from one form to another
rock cycle
Who is the Worlds best 7th grade science teacher
Santoro