Thursday, February 12, 2009

the rock cycle

The rock cycle has many different parts. first there is magma and crystalization follows after when the magma is through crystalizing it forms Ignious rock then weathering,erosion&deposition occurs and what follows that is sediment is born and later it turns into sedimentary rock,when heat and pressure gets to the rock it makes medemorphic rock and it melts back into magma and thats the rock cycle



3 TYPES OF PLATE TECTONIC MOVEMENTS :



Exploring Earth (more info) . Plate tectonic animations of 1.) Alternating magnetic polarity recorded at mid-ocean ridges (divergence), 2.) Processes that occur along plate boundaries (divergent, convergent, and transform motion), and 3.) Growth of a continent (convergence and subduction). Animations coded as ES0803, ES0804, and ES0804 found in Chapter 8: Plate Tectonics. Created by the Center for Earth and Space Science Education at TERC, Inc., Cambridge, Massachusetts.

Plate Tectonic Animations (more info) . Thirteen simple plate tectonic animations (gifs) grouped into two related series depicting: 1) modern position of plate boundaries and plate motions through geologic time, and 2) creation of crust at mid-ocean ridge (i.e., divergent boundary) and imaging of magnetic stripes on the seafloor. Animations were originally produced for the US Geological Survey video 'Secrets in Stone'.
Educational Multimedia Visualization Center: Downloads (more info) . Nine animations address tectonics of the west coast of North America, many aspects of transform boundaries and strike-slip faulting. Animations also depict subduction, rifting and volcanism, and oil reservoirs.
This Dynamic Earth: the Story of Plate Tectonics (more info) . Still images used to introduce the concept of plate tectonics in this classic treatment from the USGS. Illustrations are concise and easy to understand, and used to depict topics such as plate boundaries; plate motions; and hotspots and mantle thermal plumes. Includes a particularly clear and informative historical perspective.
Plate Movement Through Time :
Paleogeography and Geologic Evolution of North America (more info) This website was developed by Dr. Ron Blakey at Northern Arizona University. The site consists of images showing how current research suggests the North American continent has developed over the last 550 million years. The 41 maps show projections of how the continent looked at particular points in geologic time.
Regional Paleogeographic Views of Earth History (more info) Contains a series of plate-tectonic reconstructions showing relative plate positions through Earth history. These beautiful reconstructions by geologist Ron Blakey (Northern Arizona University) are organized by three categories: Paleogeographic Globes; Tectonics, Sedimentation, Paleogeography; and First Order Global Tectonic Features.
Paleomap Project (more info) . Paleogeographic globes that move, tilt, and spin to allow viewing from different angles, and animated plate-tectonic maps that show plate movement and sea-floor spreading for different periods in earth history are available for purchase. Paleomap Project is the creation of Christopher R. Scotese at the University of Texas at Arlington.

No comments:

Post a Comment