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Geologist study how natural resources are formed and used. What is the slowest and largest cycle that forms soils and igneous materials in the Earth's crust over time?
The correct response is rock cycle_._This cycle takes millions of years, and forms soil and rocks within the Earth's crust. Igneous materials are one of the 3 types of rocks.
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The rock cycle is one of the slowest and largest cycles on the Earth. Which of the following is not a process involved in the rock cycle?
The correct response is anamorphism . This term has nothing to do with the rock cycle.
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Which of the following rock types is a result of the rapid cooling of magma?
The three main rock types are sedimentary, igneous, and metamorphic. Sedimentary rock is the result of the build up of sediment, such as sand or dirt. Igneous rocks are the result of the cooling of lava and molten rock, and can be crystalline in structure. Metamorphic rock is the compression of igneous and/or sedimentary rock, creating a new type of rock from intense pressure. Metamorphic rock comprises the majority of the Earth's crust.
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Which of the following pairs of terms best identifies the two types of igneous rock?
Igneous rocks are divided into two types: intrusive and extrusive. Intrusive means that the rock cooled inside the earth and these rocks are usually large-grained. Extrusive means that the rock cooled outside the earth and is usually fine-grained (volcanic rock).
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A scientist is examining two pebbles of a similar composition lying next to each other in a stream. One has a smooth, polished texture, while the other is angular with sharp edges. The differences in surface texture can indicate which of the following regarding the distance each pebble has traveled?
As rocks travel further from the original outcrop, bumps and abrasions round corners and polish the rock.
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Which of the following factors can cause a sedimentary rock to change into a metamorphic rock?
Increasing temperature and pressure—through burial or submersion—causes the minerals that compose the rock to become unstable. This results in recrystallization of the minerals, which forms a new rock.
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A sedimentary rock is buried deep within the earth. At a certain depth, the rock melts completely and recrystallizes. Which of the following best identifies what type of rock is formed post recrystallization?
The question indicated that the rock melted completely. When a partially melted rock recrystallizes, it becomes a metamorphic rock; however, when a rock completely melts and any crystallization occurs, it results in the production of an igneous rock.
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Which of the following best explains the difference between weathering and erosion?
Weathering is a process that creates sediment. There are physical and chemical weathering processes. On the other hand, erosion is described as a process that transports sediment. Erosion transports sediment through exogenous processes, such as by water or wind.
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In the desert, a rock can experience seasonal cycles of freezing and cooling. The heat of the day causes ice to melt and the cold temperatures at night causes water to freeze and expand inside cracks present in the rock. This example is indicative of which of the following types of weathering?
The freeze-thaw cycle acts like a chisel that produces fractures throughout the rock. Water rests in cracks on the rock’s surface and when it freezes it expands and causes more fractures. Water can then lay in these new fractures and further weather or crack the rock. This example represents a physical weathering process.
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A stream with lots of pebbles of various shapes and sizes is buried. What type of rock will be created when these pebbles are lithified?
Pebbles of various sizes and shapes will create a sedimentary rock called a conglomerate rock.
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What type of rock will form when beach deposits composed of sand and shells are lithified?
When lithified, sand and shells will create limestone. Limestone is a type of sedimentary rock.
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Which of the following aquatic environments will most likely form shale—a fine-grained sedimentary rock?
Shale is a very fine-grained sedimentary rock and it is often composed of clay particles. This means that it has to be deposited into a calm environment with little water movement.
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Which of the following statements about the rock cycle is not true?
Rocks can transition between sedimentary, metamorphic, and igneous rocks. Sedimentary rock forms from the weathering of any rock type. Igneous rock forms from the melting of any rock type. Metamorphic forms from recrystallization (without melting) any type of rock.
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Which of the following kinds of rock is most commonly formed in desert environments?
Sandstone is created in many environments, however it is most commonly produced in deserts and beaches.
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Which of the following types of rock forms primarily in the Hawaiian Islands?
The Hawaiian Islands were formed when hotspots that allowed the mantle to crystallize into igneous rock on the ocean floor. Over time this process created the island chain.
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During the rock cycle, three types of rocks are created. Which type of rock is formed as magma from the Earth's mantle and crust cools and solidifies?
The correct response is igneous rock. Sedimentary rock is made of various sediments that accumulate over time. Metamorphic rock is made under high pressure, high temp, and/or chemical compounds that alter the crystalline structure, the appearance, and the physical properties of the rock. The other two answer choices are not rock types.
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A geologist had the opportunity to collect rock cycles on a tiny island off the coast of Italy. He noticed that the rocks were formed of compacted shells and skeletons from dead organisms. Based on your understanding of the three types of rocks formed during the rock cycle, which rock type did the geologist collect?
The correct response is sedimentary rock. Sedimentary rock is made of various sediments that accumulate over time, like dead plants and animals and other rocks. Metamorphic rock is made from existing rocks placed under high pressure, high temp, and/or chemical compounds that alter the crystalline structure, the appearance, and the physical properties of the rock. Igneous rocks are formed as magma cools and solidifies. The other two answer choices are not rock types.
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There are three basic types of rocks.
Which type of rock is the result of the heating and cooling process alone?
Igneous rock is formed when magma/lava cools and solidifies. Igneous rock is weathered, eroded, transported and deposited to form sedimentary rock. If igneous or sedimentary rocks are subjected to great heat and pressure they transform into metamorphic rock. Metamorphic rock can be reheated and re-pressurized to create different types of metamorphic rock.
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