31 terms

Chewning Science 8 Week 1(Evolution and Maps)

The study of how things change over time
Billions of years long
Hundreds of millions of years long
Tens of millions of years long
Millions of years long
Natural Selection
Organisms that best adapt to their environment will most likely survive
Organisms produce more offspring than can survive
When organisms compete for resources
A trait that improves an organism's chance of survival
Change over time
The imprints or remains of organisms that were once alive
Mass Extinction
When many organisms become extinct at once
Absolute dating
It tells the actual age of a fossil or rock or how long ago an event happened
Relative dating
It tells the actual age of something by comparing it to something else
Law of Superposition
In undisturbed rock layers, older layers of rock lie beneath the younger rock layers
Global Warming
An increase in global temperatures due to carbon dioxide in the atmosphere
Ice Cores
Layers recording the amounts of gas in the atmosphere during the time the ice formed
Transform Boundary
When plate move side by side creating most earthquakes
When one tectonicplate is pushed under another
Theory of Continental Drift
Theory that all the continents were one continent. The big continent (called Pangaea) slowly moved to apart to the continents' present locations
Mechanical Weathering
Breaks rocks apart without changing the rocks' chemical composition
Theory of plate Tectonics
The earth's lithosphere( land) is broken into big chunks that move and change position over time
Divergent Boundaries
When plates move apart creating sea floors
Convergent Boundaries
When plates move together creating earthquakes or cause the formation of mountains or volcanoes
Chemical Weathering
When their are changes in the chemical composition of rocks. Because of this the rock is weaker and may break and dissolve
Topographic Maps
Maps that show the location and elevation ( how high or low things are). They tell ou whether areas are steep or level
The study of earth's surface by making maps
Remote Sensing
A way of collecting information about an area without visiting the area
Ground Truthing
Visiting an area so one can check the map made by remote sensing
Contour Lines
Lines on a topographic map that connect areas with the same elevation.
Urban sprawl
The spreading out of city features such as neighborhoods and shopping districts into areas that were once rural or open country.