s tory in the r ocks by anna moorhead, summer hatton, and gavin jones
TRANSCRIPT
STORY IN THE ROCKSBy Anna Moorhead, Summer Hatton, and Gavin Jones
WEATHERING
WEATHERING is a process that decomposes rock, and it occurs in place.
CHEMICAL WEATHERING: involves a chemical change in some of the minerals of a rock
PHYSICAL WEATHERING: involves physically breaking rocks into pieces.
SEDIMENT is material eroded off of rocks that is moved by water, wind, or ice.
ROCK WEATHERED BY WINDHTTP://IMAGES.TRAVELPOD.COM/USERS/KITKROZSER/1.1243715284.WEATHERED-ROCK.JPG
http://www.incadventures.com/images/grand-canyon-skywalk-rainbow-485.gif
EROSION
EROSION is when a loosened rock piece is moved by water, air, or ice.
Moving water is its main agent. GRAVITY is the force that pulls things to the
center of Earth. It causes eroded material to slide downhill.
THE GRAND CANYON—SCIENTISTS THINK IT WAS ERODED AWAY BY ROCK.HTTP://WWW.INCADVENTURES.COM/IMAGES/GRAND-CANYON-SKYWALK-RAINBOW-485.GIF
ROCK CYCLE
The ROCK CYCLE is a model that explains how the different types of rocks are formed.
IGNEOUS ROCKS are rocks formed above and below ground from magma or lava hardening
SEDIMENTARY ROCKS are rocks that form from pieces of rock carried downstream, dropped, and harden into layered rock.
METAMORPHIC ROCKS are rocks that have “morphed” after being under tons of pressure and heat underground.
FOSSILS AND THE GEOLOGIC TIME SCALE
FOSSILS are impressions/remains of a living creature pressed or buried in rock.
The GEOLOGIC TIME SCALE is the method used to divide Earth’s natural history into parts—it’s determined by rock and fossil finds.
THE LAW OF SUPERPOSITION states that in layers of undisturbed rock, the youngest layer is on top and the oldest is on the bottom.
FISH FOSSIL AND ROCK LAYERS
http://www.mr-damon.com/photo_album/fossils/fish_fossil.jpg
http://www.petrostrategies.org/images/rock09.JPG
LINKS
http://imnh.isu.edu/digitalatlas/geo/basics/diagrams.htm
www.fi.edu/fellows/felow1/rocks/create/igneous.htm
http://education.usgs.gov/schoolyard/RockSedimentary.html
www.fi.edu/fellows/fellow1/oct98/create/metamorph.htm
www.dictionary.com www.nature.nps.gov/geology/usgsnps/misc/gwear
o.html www.watersheds.org/earth/erosion.htm www.wikipedia.org