©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
EESA06 LECTURE 4 NOTES UPDATED 2024
The rock cycle - Ans:✔✔-the series of processes that change one type of rock into another type of rock
-Igneous, sedimentary and metamorphic
Igneous rocks - Ans:✔✔--formed at convergent margins are 'acidic' (silica-rich) e.g., andesite typical of
continental crust . Associated with stratovolcanoes
-formed at divergent margins are 'basic' (iron-rich and silica poor) e.g., basalt typical of oceanic crust.
Associated with Shield volcanoes
Rift - Ans:✔✔-a geological term for when crust tends to break up (cracks) which turns into an embryonic
ocean
Igneous rocks are made by - Ans:✔✔-the cooling of magma (means born of fire)
two broad groups of igneous rocks are: - Ans:✔✔-1) The first one contains silicate
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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
-When it is silicate it tends to be very stiff and does not flow very easily
-Viscosity is the ease at which fluid moves
2)Does not have silicate in it, and fluids flow very easily (like blood)
-not explosive
heat flow - Ans:✔✔-a measure of the amount of heat leaving the rocks of the lithosphere
once part of the magma starts to rise towards the earths surface - Ans:✔✔-the pressure gets less
ULVZ - Ans:✔✔-ultra low velocity zone
the mantle is always being - Ans:✔✔-overturned - convection
convection - Ans:✔✔-Process by which, in a fluid being heated, the warmer part of the mass will rise and
the cooler portions will sink.
we are on the move due to - Ans:✔✔-convection
Page 2/6
FIRST PUBLISH OCTOBER 2024
EESA06 LECTURE 4 NOTES UPDATED 2024
The rock cycle - Ans:✔✔-the series of processes that change one type of rock into another type of rock
-Igneous, sedimentary and metamorphic
Igneous rocks - Ans:✔✔--formed at convergent margins are 'acidic' (silica-rich) e.g., andesite typical of
continental crust . Associated with stratovolcanoes
-formed at divergent margins are 'basic' (iron-rich and silica poor) e.g., basalt typical of oceanic crust.
Associated with Shield volcanoes
Rift - Ans:✔✔-a geological term for when crust tends to break up (cracks) which turns into an embryonic
ocean
Igneous rocks are made by - Ans:✔✔-the cooling of magma (means born of fire)
two broad groups of igneous rocks are: - Ans:✔✔-1) The first one contains silicate
Page 1/6
, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
-When it is silicate it tends to be very stiff and does not flow very easily
-Viscosity is the ease at which fluid moves
2)Does not have silicate in it, and fluids flow very easily (like blood)
-not explosive
heat flow - Ans:✔✔-a measure of the amount of heat leaving the rocks of the lithosphere
once part of the magma starts to rise towards the earths surface - Ans:✔✔-the pressure gets less
ULVZ - Ans:✔✔-ultra low velocity zone
the mantle is always being - Ans:✔✔-overturned - convection
convection - Ans:✔✔-Process by which, in a fluid being heated, the warmer part of the mass will rise and
the cooler portions will sink.
we are on the move due to - Ans:✔✔-convection
Page 2/6
