Topography – Massive Igneous Rocks (Grade 11 NSC Matric Geography): Flashcards
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Characteristics of massive igneous rocks
Characteristics of massive igneous rocks
Uniform colour & texture, no internal layering
Effect of slow magma cooling underground
Effect of slow magma cooling underground
Forms large, coarse crystals
Greek origin of 'batholith'
Greek origin of 'batholith'
Bathos (depth) + lithos (rock)
Minimum surface area of batholiths
Minimum surface area of batholiths
100 square kilometres
Shape described by lopolith name
Shape described by lopolith name
Dish or bowl (from Greek 'lopas')
How laccolith forms underground
How laccolith forms underground
Overlying rocks buckle upward from magma pressure
Most common rock type in sills
Most common rock type in sills
Dolerite
Landforms created by exposed sills
Landforms created by exposed sills
Structural terraces, mesas, and buttes
Dyke landform if more resistant than surrounding rock
Dyke landform if more resistant than surrounding rock
Serrated ridge
Weathering process creating dome shapes
Weathering process creating dome shapes
Exfoliation (expansion/contraction peels outer layers)