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Rocks walcott
rocks
| Question | Answer |
|---|---|
| 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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