L2 : EARTH'S INTERNAL HEAT SOURCES Flashcards
In order to survive the organisms and other living things, _____ is needed to survive which they come in Internal and External sources.
heat
In order to survive the organisms and other living things, heat is needed to survive which they come in _____ and ______ sources.
internal and external heat
The Earth’s _________ energy supplies the natural phenomena like Earthquakes and Volcanic Eruptions
internal heat
______ rocks are formed by cooling above the earth’s surface
extrusive
______ rocks are formed by cooling beneath/below the earth’s surface
intrusive
A large body of igneous rock formed beneath the Earth’s surface by the intrusion and solidification of magma
a. batholith
b. laccolith
c. sill
a. batholith
A______ is a body of intrusive rock with a dome-shaped upper surface and a level base. It forms when magma rising through the Earth’s crust begins to spread out horizontally.
a. batholith
b. laccolith
c. sill
b. laccolith
A ____ is a tabular sheet intrusion that has intruded between older layers of sedimentary rock.
a. batholith
b. laccolith
c. sill
c. sill
4 major earth’s internal heat sources
Primordial heat
Heat from the decay of Radioactive elements
Gravitational Pressure
Dense core material
Earth’s was formed about?
4.6 billion years ago
The Earth was formed from the process of ______ wherein gasses and dust of cloud was attracted by gravitational energy. When these masses compacted it formed _______.
accretion, planetesimals
This process is known as ___________ by which the spontaneous breakdown of an atomic nucleus causes the release of energy and matter form the nucleus.
radioactive decay
4 Naturally Radioactive Isotopes in Earth
POTASSIUM 40
URANIUM 235
URANIUM 92
THORIUM 232
Scientist believes that tectonic plates move because of ___________ that flow up from the core of the earth and circulate under the athenosphere.
convection currents
The ____ core as the _____ most most layer is composed primarily of iron and nickel which contributes to the density in the core that ranges between 12600 - 13000 kg/m3.
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