Earth´s Structure (Topic 4)

Despite its very high temperature (around 5000°C), it is solid because of the great pressures that the superior layers exert on it.

• Upper mantle

• Internal Nucleus

• Lower mantle

• External Nucleus

__________Also called interior mantle, is mainly composed of iron silicates and is solid.

• Nucleus

• Lower mantle

• Crust

• Upper mantle

Contains solid elements, called magma. When it melts, magma is expelled to the Earth’s surface through volcanic eruptions, cracks or fissures, and is known as lava.

• Oceanic crust

• upper mantle

• Continental crust

• lower mantle

Its thickness has barely 35 kilometers, but it is greater in the mountainous zones.

• Oceanic crust

• Continental crust

• Tectonic plates

Basaltic rocks predominate. The___________ covers the upper mantle and is the seat of the continental cortex.

• Nucleous

• Mantle

• Oceanic crust

• Continental crust

It is formed also by 16 tectonic plates that move above one of the mantle’s most fluent zone, called asthenosphere.

• Lithosphere

• Oceanic crust

• Continental curst

• Continental slope

Is a branch of geology that studies the Earth’s internal phenomena

• Seismicity

• Tectonics

• Vulcanism

The name of super continent was?

• Panthalassa

• Laurasia

• Pangea

• Gondwana

_________Are the zones where the plates are being separated by the ascendant currents of the upper mantle, especially under the sea.

• Subduction zone

• Bigger plates

• Expansion zones

• Smaller plates

The Earth landscape is formed by the plate collisions. These collisions are________________, which means, internal factors because they come from within the Earth.

• Exogenous factors

• Endogenous factors

• Human activity

• Earthquakes