Earth's Interbal Energy Flashcards
(25 cards)
What are the consequences of the collision of the two lithospheric plates?
If they are two oceanic plates one of them goes under the surface so land is destroyed
If they are two continental plates mountains are formed so land is destroyed
If they are one continental and one oceanic, oceanic goes under so land is destroyed
How do oceanic ridges get formed?
When two oceanic divergent boundaries makes new land from magma
What is a volcano?
It is an opening in the earth’s surface, wich allows hot, molten rock, ash and gases to escape from deep below the surface
What is a volcanic cone?
It is a deposit of lava and ash inside of a volcano
What is a crater?
It is the hole where the lava goes outside
What is the magma ?
It is melted rock with materials mexclate with ash.
What is lava ?
It is melted rock mexclate with materials
What kind of products are expeled by a volcano?
Liquid products: wich are the lavas
Gaseous products: mainly vapour, hydrogen sulfude and carbon dioxide
Solid products: knows are pyroclastic derbis. Ashes 64mm
How many types of volcanoes are ?
ACORDING TO ITS MINERAL AND GASEOUS COMPOSITION
Hawaiian: magmas of low viscosity and low content of gases. The gentlest eruptions. Typical from hawaii
Strombolian: magma with more viscosity more violent eruption with extensive lava flow. They are more typical. Mountain Strombo
Pelean: high viscosity of the magma, and the gases escape with more difficulty. The most violent. Lava comes almost solid. Mountain Pele
What is the meaning of low-magnitude volcanism?
It’s the volcanic activity on a certain place
The most common phenomena are:
Fumaroles cracks of fissures which emit steam and gases
Hot springs places where water flows out of the ground water with lots of minerals
Geysers a type of hot spring that erupts periodically , ejecting a colum of hot water and steam into the air
What is the name of the earth’s internal energy?
Geothermic energy is responsible for many of the geological phenomena: continental drift( movement of the continents), earthsquakes, volcanoes and orogenies (Mountain building)
Why the earth is hot?
Because when it was building a celestial Body impacts to it, and because of the radioactive elements
What is the continental drift? Who proposed this theory?
The continental drift is a theory that says that the contontinents are in constantly moving and says that before the continents were together in a big one called pangea and Alfred Wegener proposed this theory
With what evidences supported Alfred the theory of the contontinental drift ?
Geographical: the south América and south África continents ensamble like a puzzle
Climate: there are glacial remains in Brazil or Congo, and deposita of Bituminous Coal in Greenland that suggest that these countries in the past where in other place
Biological: there are on the Both side of the atlantic ocean terrestial animals unable to swim
Paleontological: there are fossils the same plants and animals on the Both sides of the atlantic
What is the lithosphere?
The crust and the rigid uppermost part of the mantle
What is the asthenosphere?
It is the ayer above the lithosphere Wich is although solid
What are the convective currents?
They are the responsives of the movement of the plates
What are divergent boundaries ?
Occur where two plates slides apart from each other, which form new land
What are convergent boundaries ?
Occur where two plates collide. Usually one goes under the other. This phenomena is called subduction.
What are transform boundaries?
Occur where plates slide past each other.
What is an earthquake?
It is a phenomenon that results from and is powered by the sudden release of stored energy in the crust that propagates.
The elements of an earthquake are:
Focus : starting point
Epicenter: the point on the earth that the earthquake actuate
Seismic waves: vibrations that cames from the focus
How many types seismic waves are?
P waves: travel fastest 1.4 -8km per second
S waves: more slowly usually at 60% to 70% of the speed of p waves
How methamorphic rocks are formed?
By the alteration of pre-existing rocks that undergo in crease in temperature, pressure ore both. The undergo one ore Both of the following processes:
Mineral changes: growth of new minerals more atable at the new conditions
Textural changes : recrystalization and alignment of minerals
What is foliantion?
Refers to looking like layers caused by the alignment of some minerals
FOLIATED: slate, schist and gneiss
NON FOLIATED: marble, quartzite
