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UNIT 7: INTERNAL ENERGY AND RELIEF
• As we saw in unit 6, there are convection currents in the mantle.
• These currents cause the lithospheric plates to move and sometimes grow larger or smaller.
• Lithospheric plate boundaries are especially active. There are three types:
• Convergent boundaries
• Divergent boundaries
• Transform fault boundaries
Lithospheric plates move
THE EARTH RELIEF
• These are the edges between two plates moving towards each other.
Convergent boundaries
Usually, one plate sinks inside the mantle, destroying part of the lithosphere and shrinking in size.
There are usually deep trenches where the two plates meet.
The other plate gets pushed up, forming a mountain range.
As the sinking plate melts, it generates magma, which results in intense volcanic activity in these areas.
THE EARTH RELIEF
THE EARTH RELIEF
OBSERVA EL VIDEO DE LA FORMACIÓN DEL HIMALAYA
• These are the edges between two plates moving away from each other.
• They usually coincide with oceanic ridges.
Divergent boundaries
A rift forms between the two plates. Molten material from the mantle rises up through these rifts, forming new lithosphere.
As new lithosphere is formed, both plates grow in size.
Natural Science 2. Secondary Education
THE EARTH RELIEF
• Also called conservative boundaries, these occur when two plates touch as they move parallel to one another in opposite directions.
Transform fault boundaries
Because the plates slide past each other, no lithosphere is created or destroyed and so the plates stay the same size.
Although volcanic activity is usually not present, transform fault boundaries are sites of intense seismic activity.
Natural Science 2. Secondary Education
THE EARTH RELIEF
EVOLUCIÓN DE RIFT
OCEANIC RELIEF
OCEANIC RELIEFVIDEO DORSALES OCEÁNICAS
OCEANIC RELIEF
OCEANIC RELIEF
DEFORMACIONES DE LAS ROCAS: LAS FALLAS
DEFORMACIONES DE ROCAS: LAS FALLAS
IMÁGENES DE FALLAS
IMÁGENES DE FALLAS
DEFORMACIÓN DE ROCAS: LOS PLIEGUES
IMÁGENES DE PLIEGUES
IMÁGENES DE PLIEGUES
LAS ROCAS: ROCAS SEDIMENTARIAS
LAS ROCAS SEDIMENTARIAS
ROCAS COMPACTAS Y CRISTALIZADAS DE ENFRIAMIENTO LENTO.
ROCAS DE ENFRIAMIENTO RÁPIDO COMO LA OBSIDIANA O LA PUMITA (NO POSEEN CRISTALES) O DE ENFRIAMIENTO MÁS LENTO COMO EL BASALTO (CRISTALES PEQUEÑOS).
LA PUMITA O PIEDRA POMEZ ES DE COLOR CLARO Y MUY POROSA.
EJEMPLOS DE ROCAS MAGMÁTICAS
LA PUMITA O PIEDRA PÓMEZ ES UNA ROCA VOLCÁNICA POROSA, GENERALMENTE DE COLOR CLARO.
LAS ROCAS METAMÓRFICAS
LAS ROCAS METAMÓRFICAS
LAS ROCAS METAMÓRFICAS
EJEMPLOS ROCAS METAMÓRFICAS
EJEMPLOS ROCAS METAMÓRFICAS
ZONAS METAMÓRFICAS
RODEANDO MAGMAS
EN FALLAS
GRANDES ZONAS PLEGADAS
THE ROCK CYCLE
THE ROCK CYCLE
EL CICLO DE LAS ROCASVIDEO CICLO ROCAS
