PLATE TECTONICS Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
| Question | Answer |
| theory proposed by Alfred Wegener that states that the continents were once joined as a super continent | Continental Drift |
| large, ancient landmass that was composed of all the continents joined together | Pangea |
| Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge | Seafloor Spreading |
| theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantle | Plate Tectonics |
| a large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the athenosphere | Plate |
| Large pieces of earth's crust | plates |
| Theory based on evidence that plates are moving slowly and constantly. | Theory of Plate Tectonics |
| Supercontinent | Pangea |
| Cracks between the plates | plate boundaries |
| force that acts on rock to change its shape or volume | stress |
| stress that pushes a mass of rock in two opposite directions | shearing |
| stress that squeezes rock until it folds or breaks | compression |
| stress force that pulls on the crust, stretching rock to become thinner | tension |
| shaking and trembling that results from the movement of rock beneath Earth's surface | earthquake |
| break in the Earth's crust where slabs of crust pass by each other | fault |
| Shearing creates this type of fault | slip-strike |
| Compression produces this type of fault | reverse |
| Tension forces in Earth's crust produce this type of fault | normal |
| Half the fault that lies above the fault | hanging wall |
| Half the fault that lies below the fault | footwall |
| bends in the rock | folds |
| large area of flat land elevated high above sea level | plateau |
| point beneath surface where rock is under stress and breaks | focus |
| point on surface directly above the focus | epicenter |
| first waves (compressional similar to a slinky) | p waves |
| secondary waves (move perpendicular to direction of movement) | s waves |
| move slower, but produce severe ground movements (making the ground roll like a water wave) | surface waves |
| Rates earthquakes according to intensity | Mercalli scale |
| a rating of the size of seismic waves measured by a seismograph | Richter scale |
| Scale used today by geologists | Moment Magnitude Scale |
| the theory that continents can drift apart from one another and have done so in the past | continental drift |
| the process by which new oceanic lithosphere is created at mid-ocean ridges as older materials are pulled away from the ridge | sea-floor spreading |
| the theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere | plate tectonics |
| the boundary between two colliding tectonic plates | convergent boundary |
| the region where an oceanic plate sinks down into the asthenosphere at a convergent boundary, usually between continental and oceanic plates | subduction zone |
| the boundary between two tectonic plates that are moving away from each other | divergent boundary |
| the boundary between two tectonic plates that are sliding past each other horizontally | transform boundary |
| a break in the Earth's crust along which two blocks of the crust slide relative to one another | fault |
| the bending of rock layers due to stress in the Earth's crust | folding |
| the type of stress that occurs when an object is squeezed | compression |
| the type of stress that occurs when forces act to stretch an object | tension |
| the amount of force per unit area that is put on a given material | stress |
| a layer of hot rock | mantle |
| the part of the mantle that is made of soft rock that bends like plastic | asthenosphere |
| a dense ball of solid metal | inner core |
| the transfer of energy through empty space | radiation |
| heat transfer within a fluid | convection currents |
| the continents were once joined together in a single landmass | continental drift |
| the name of the supercontinent that existed millions of years ago | Pangaea |
| any trace of an ancient organism that has been preserved in rock | fossil |
| are found in all of Earth's oceans | mid-ocean ridges |
| technology used by scientists used in the mid-1900s to map the mid-ocean ridge | sonar |
| the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle | subduction |
| the geological theory that states that pieces of Earth's lithosphere are in constant, slow motion | plate tectonics |
| forms at a divergent plate boundary | rift valley |
| molten material rises from the mantle and erupts along mid-ocean ridges | sea-floor spreading |
| produced by a collision between two pieces of continental crust at a converging boundary | mountain range |
| when you touch a hot pot or pan and energy moves from the pot to your hand | heat transfer |
| a place where two plates slip past each other, moving in opposite directions | transform boundary |
| Wegener's hypothesis taht all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions | Continental Drift |
| large, ancient landmass that was composed of all the continents joined together | Pangea |
| Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge | Seafloor Spreading |
| theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantle | Plate Tectonics |
| a large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the athenosphere | Plate |
| plasticlike layer of Earth on which the lithospheric plates float and move around | Asthenosphere |
| rigid layer of earth about 100 km thick made of the crust and a part of upper mantle | Lithosphere |
| current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics | Convection Current |
| vibrations produced when rocks break along a fault | Earthquake |
| seismic wave that moves rock particles back and forth in the same direction that the wave travels | Primary Waves |
| seismic wave that moves rock particles at right angles to the direction of the wave | Secondary Waves |
| seismic wave that moves rock particles up and down in a backward rolling motion and side to side in a swaying motion | Surface waves |
| point on earth's surface directly above an earthquake's focus | Epicenter |
| instrument used to register earthquake waves and record the time that each arrived | seismograph |
| opening in earth's surface that erupts sulfurous gases, ash, and lava, can form at earth's plate boundaries, where plates move apart or together, and at hot spots | volcano |
| opening where magma is forced up and flows out onto earth's surface as lava forming a volcano | vent |
| steep-walled depression around a volcano's vent | crater |
| the result of an unusually hot area at the boundary between earth's mantle and core that forms volcanoes when melted rock si forced upward and breaks through the crust | hot spot |
| broad, gently sloping volcano formed by quiet eruptions of basaltic lava | shield volcano |
| steep-sided, loosely packed volcano formed when tephra falls to the ground | cinder cone volcano |
| volcano built by atlernating explosive and quiet eruptions that produce layers of tephra and lava; found mostly where earth's plates come together and one plate sinks below the other | composite volcano |
| bits of rock or solidified lava dropped from the air during an explosive volcanic eruption; ranges in size from volcanic ash to volcanic bombs and blocks | Tephra |
Created by:
rrosset
Popular Earth Science sets