160 likes | 323 Views
The Rock Cycle. By Lane W. Nixon and Jennifer Ambler. What is Rock?. Rocks are made of crystal grains grain characteristics color size large small type interlocking (like Granite ) hard rounded (like Sandstone ) porous (absorb water) soft crumbly. Do rocks ever change?.
E N D
The Rock Cycle By Lane W. Nixon and Jennifer Ambler
What is Rock? • Rocks are made of crystal grains • grain characteristics • color • size • large • small • type • interlocking (like Granite) • hard • rounded (like Sandstone) • porous (absorb water) • soft • crumbly
Do rocks ever change? • Click to add an outline Yes! rocks can change or transform. Sandstone Granite
Why do Rocks Change? • Continuous cycle of grain growth and destruction called THE ROCK CYCLE Forces: • Weathering • Erosion • Heat • Pressure • Cooling • Melting • Compaction • Cementation
THE ROCK CYCLE • Three major types of rock: • Igneous • Sedimentary • Metamorphic
Igneous Rock • Formed when magma or molten rock cools and solidifies. Obsidian Pumice
Sedimentary Rock • Formed wherever sediments accumulate. Conglomerate Limestone
More Sedimentary Rock Sandstone closeup From Utah, sandstone More sandstone
Metamorphic Rock • Formed when heat, pressure, and chemical reactions alter the grains of the rock. Marble Slate
More Metamorphic Rock More marble
Question • Rocks have been categorized in terms of the Rock Cycle. • Can we also categorize rock in terms of crystal grain size and shape?
References http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/rock_cycle_intro.shtml http://www.msnucleus.org/membership/slideshows/rockCycle2.html http://www.rocksandminerals4u.com/rock_cycle_lesson.html http://geology.com/rocks/igneous-rocks.shtml http://geology.com/rocks/metamorphic-rocks.shtml http://geology.com/rocks/sedimentary-rocks.shtml http://www.exo.net/~emuller/activities/#earthscience