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rocks
Question | Answer |
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Which rock is only formed by regional metamorphism? | Slate |
Wavy bands of light and dark minerals visible in gneiss bedrock probably formed from the | heat and pressure during metamorphism |
Which sedimentary rock is most likely to be changed to slate during regional metamorphism? | Shale |
The rock shown below has foliated texture and contains the minerals amphibole, quartz and feldspar arranged in coarse-grained bands | gneiss |
Which physical characteristic best describes the rock phyllite? | Foliated texture with microscopic mica crystals |
Which rock is foliated shows mineral alignment but not banding and contains medium-sized grains of quartz and pyroxene? | Schist |
Which sequence of change in rock type occurs as shale is subjected to increasing heat and pressure? | shale-slate-phyllite-schist-gneiss |
Which type of rock most likely formed in zone A? | marble |
What kind of rocks does the complaining rock collector want? | regionally metamorphosed rocks |
Particles of sediment collected from a lake bottom average 1.2 centimeters in diameter. If left on the lake bottom to become buried by more sediment and compressed into rock, these particles would form | conglomerate |
Which land-derived sedimentary rock could have formed by the compaction and cementation of particles smaller than 0.0003 centimeters in diamteter? | shale |
Which type of rock is represented by the map symbol below? | chemically formed sedimentary rock that consists mainly of the mineral calcite |
Which characteristic determines whether a rock is classified as shale, a siltstone, a snastone or a conglomerate? | the particle size of the sediments within the rock |
Which sequence of events occurs in the formation of a sedimentary rock? | Source material eroded- sediments deposited-sediments compacted and cemented |
What do each of these areas of mineral deposits have in common? | They were once covered by evaporating seas |
Limestone, gypsum and salt are rocks formed by the processes of | evaporation and precipitation |
Which process could lead directly to the formation of pumice rock? | explosive eruption of lava from a volcano |
Which process is necessary for the formation of igneous rocks? | solidification |
Which characteristics provides the best evidence that obsidian rock formed in an extrusive environment | noncrystalline glassy texture |
Igneous rocks | from cooling and solidfication of lava or magma |
Intrusive rocks | magma cools slowly, large crystals form |
Extrusive rocks | lava cools quickly, small or no crystals form, may be vesicular and contains air bubbles |
Sedimentary rocks | Generally form from the compaction and cementation of sediments |
Clastic rocks | compacted sediment, classified by size |
Organic crystalline | evaporates, precipitates and biological matter |
Metamorphic rock | rocks are changed as a result of exposure to intense heat or pressure |
Contact metamorphism | heat |
Regional metamorphism | pressure |
Rocks are classified into three different groups depending on | how they form ( origin ) |
Magma | lava that stays underground / melted rock underground |
lava | lava that shoots out from the volcano |
Intrusive igneous rocks | form from magma that cools down slowly under the ground. The slower the magma cools down the larger the intergrown crystals become |
Extrusive rocks | Rocks that form when lava exits the earth and cools very quickly at the surface |
Sedimentary rocks form from the | compaction and cementation of particles of rocks and sediments |
Clastic sed. Rocks | from when particles are compacted and cemented togther |
Clastic rocks are grouped / classified according to | size of the sediment particles in the rock |
Chemical Sed. Rocks | Form when water evaporates and leaves mineral crystals behind or when crystals form in water |
Bioclastic Sed. Rocks | Form from orgaince matter and or contains remnants of living things |
Metamorphic rocks | form from the re-crystallization of unmelted rock material under intense heat and or pressure |
Regional Meta. Rocks | Large regions under intense heat and or pressure become metamorphic |
Contact Meta Rocks | forms at the interface between magma and surrounding rock underground |