Unit 7, Earth internal energy and relief, 2ESO

1. UNIT 7: INTERNAL ENERGY
AND RELIEF

3. • 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

4. • 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

5. THE EARTH RELIEF
OBSERVA EL VIDEO DE LA FORMACIÓN DEL HIMALAYA

6. • 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.
THE EARTH RELIEF

7. • 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.
THE EARTH RELIEF

9. EVOLUCIÓN
DE RIFT

10. OCEANIC RELIEF

11. OCEANIC RELIEF
VIDEO
DORSALES
OCEÁNICAS

12. OCEANIC RELIEF

13. OCEANIC RELIEF

14. DEFORMACIONES DE LAS
ROCAS: LAS FALLAS

15. DEFORMACIONES DE
ROCAS: LAS FALLAS

16. IMÁGENES DE FALLAS

17. IMÁGENES DE FALLAS

18. DEFORMACIÓN DE ROCAS:
LOS PLIEGUES

19. IMÁGENES DE PLIEGUES

20. IMÁGENES DE PLIEGUES

23. LAS ROCAS: ROCAS
SEDIMENTARIAS

24. LAS ROCAS
SEDIMENTARIAS

25. 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).

26. LA PUMITA O PIEDRA
POMEZ ES DE COLOR
CLARO Y MUY
POROSA.

27. EJEMPLOS DE ROCAS
MAGMÁTICAS
LA PUMITA O PIEDRA PÓMEZ
ES UNA ROCA VOLCÁNICA
POROSA, GENERALMENTE DE
COLOR CLARO.

28. LAS ROCAS
METAMÓRFICAS

29. LAS ROCAS
METAMÓRFICAS

30. LAS ROCAS
METAMÓRFICAS

31. EJEMPLOS ROCAS
METAMÓRFICAS

32. EJEMPLOS ROCAS
METAMÓRFICAS

33. ZONAS METAMÓRFICAS
RODEANDO
MAGMAS
EN FALLAS
GRANDES
ZONAS
PLEGADAS

34. THE ROCK CYCLE

35. THE ROCK CYCLE

36. EL CICLO DE LAS ROCAS
VIDEO
CICLO
ROCAS