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Rocks walcott

rocks

QuestionAnswer
Magma is a mix of molten rock, gases, and mineral. true
Porphyritic textures indicate that magma has cooled very slowly throughout crystallization. false slowly, then quickly
Sandstone, with abundant quartz and orthoclase feldspar, is among the most durable of igneous rocks. false, granite
Valuable ore deposits are often associated with igneous extrusions. false, intrusions
Different minerals melt and crystallize at different temperatures. true
Igneous rocks can be identified by their physical properties of crystal size and texture. true
Igneous rocks are rarely used as building materials because of their strength, durability, and beauty false, often
Diamonds are sometimes found in igneous intrusions known as kimberlites. true
The continuous changing and reforming of rocks is called graded bedding. false, rock cycle
During physical weathering, minerals remain chemically unchanged. true
During sedimentary rock formation, cementation occurs before weathering false, after
Because of its large mass, coarse-grained clastics such as gravel tend to be transported by low-energy flows of water false, high energy
The characteristic textures and features of metamorphic rocks provide a geologic “snapshot” of surface conditions in Earth’s past. false sedimentary
Regional metamorphism is divided into low grade, intermediate grade, and high grade metamorphism. true
The porosity of sandstone allows it to hold oil, gas, and water. true
Eroded materials are almost always carried uphill. false downhill
Landslides create sorted deposits when sediment moves downhill in a jumbled mass false, unsorted
When the concentration of minerals dissolved in water reaches saturation, crystals precipitate out of solution. true
Sedimentary rocks form from rock and mineral fragments, and metamorphic rocks form from existing rock. true
As the water content of rock increases, the melting point ____. decreases
A model that illustrates the predictable patterns of mineral formation from cooling magma is ______. Bowen's reaction series
Intrusive igneous rocks form _____. coarse grained rocks
Rocks are formed when magma _______. crystallizes
Igneous rocks that cool slowly beneath Earth’s crust are ____. intrusive
Igneous rocks that cool quickly on Earth’s surface are ____. extrusive
Extrusive rocks, which cool more rapidly than intrusive rocks, are generally more ____. finely grained
Factors that affect a rock’s melting point include ____. pressure and water content
Valuable ore deposits and gem crystals are often associated with ____. igneous intrusions
What type of sediment particles have worn surfaces and rounded corners? clastic
What type of bedding has the heaviest and coarsest material is on the bottom? graded bedding
What type of sedimentary rock is coarse-grained with angular fragments? breccias
What results when rocks come in contact with molten rocks such as those in an igneous intrusion? contact metamorphism
The metamorphism of limestone results in the formation of ____. marble
Rock formed from the crystallization of magma is called _________________________. igneous
___________________________________ illustrates the relationship between cooling magma and mineral formation. Bowen's reaction series
A(n) ____________________ rock, such as dunite, has low silica content and very high iron and magnesium content. ultramafic
A rock that has grains of two different sizes has ____________________ texture. porphyritic
A(n) ____________________ is a vein of extremely large-grained minerals. pegmatitie
A rare, ultramafic rock that might contain diamonds is a(n) ____________________. kimberlite
Much of Earth’s surface is covered not by solid rock, but by ____________________. sediments
Weathering of rock produces worn surfaces and rounded corners that are characteristic of some ____________________ sediment particles. clastic
Landslides, moving water, wind, and glaciers cause ____________________ of surface materials. erosion
_________________________ are characteristic of sediments transported by water and wind. sorted deposits
The primary feature of sedimentary rocks is horizontal layering called ____________________. bedding
The percentage of open spaces between mineral grains in clastic rocks is its ____________________. porosity
The most abundant organic sedimentary rock is calcite-rich ____________________. limestone
Magma that flows out onto Earth's surface lava
Light-colored rock such as granite that has high silica content felsic rock
Dark-colored rock such as gabbro that is rich in iron and magnesium mafic rock
Rock that is very high in iron and magnesium. ultramfic rock
Texture characterized by large, well-formed crystals surrounded by finer-grained crystals of the same mineral. porphyritic
Vein of extremely large-grained minerals pegamite
Ultramafic rock that can contains diamonds. kimberlite
Extrusive rocks, which cool more rapidly than intrusive rocks, are generally more finely grained
Factors that affect a rock’s melting point include pressure and water content
Valuable ore deposits and gem crystals are often associated with igneous intrusions
What type of sediment particles have worn surfaces and rounded corners clastic
What type of bedding has the heaviest and coarsest material is on the bottom graded
What type of sedimentary rock is coarse-grained with angular fragments breccias
What results when rocks come in contact with molten rocks such as those in an igneous intrusion contact metamorphism
The metamorphism of limestone results in the formation of marble
Created by: swalscit
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