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Rck & Rock Cycle
igneous, metamorphic, & sedimentary rock process of formation
| Question | Answer |
|---|---|
| Which statement about the formation of a rock is best supported by the rock cycle? A) Magma must be weathered before it can change to metamorphic rock. B) Sediment must be compacted and cemented before it can change to sedimentary rock. | B) Sediment must be compacted and cemented before it can change to sedimentary rock. |
| Which statement best describes a general property of rocks? A) Most rocks have a number of minerals. B) Most rocks are composed of a single mineral. | A) Most rocks have a number of minerals. |
| What is the only rock that can form directly from magma? | The only rocks that can form directly from magma are igneous rocks. |
| What are the 2 things that happen when sediments form into a sedimentary rock? | When sediments get compacted & cemented together, they form sedimentary rocks. |
| What happens when the minerals in igneous, sedimentary, and metamorphic rocks completely melt? | When the minerals in rocks completely melt, they turn into magma. |
| What breaks down igneous rocks into sediments? | Weathering & erosion break down igneous rocks into sediments. |
| What evidence can you find on a rock that it is a sedimentary rock? | It has visible layers Other rocks (sediment) Organic matter (Once living objects) fossils |
| What must happen for metamorphic rock to be transformed into igneous rock? | The metamorphic rock must melt and the magma has to cool/ solidify |
| What are the 3 types of rocks involved in the rock cycle? | Igneous, sedimentary, metamorphic |
| Rock at Earth's surface is primarily affected/ altered by forces of | A.weathering and erosion |
| The rate of cooling of a magma or lava is reflected by the ________ of the rock. | texture |
| What type of volcanic rock contains a large number (a lot) of cavities (bubbles) that form when gases escape from the molten rock? | pumice |
| A glassy texture indicates: | very rapid cooling |
| A crystalline or glassy rock formed when magma or lava cools down and solidifies is called | igneous rocks |
| The major difference between intrusive and extrusive igneous rocks is: | Where they solidify (magma or lava) inside or at surface of the earth |
| Igneous rocks that form entirely beneath Earth's surface are said to be: | Intrusive |
| All the terms in the following list belong together except one. Which one does not belong? Metamorphic Heat Pressure Melting | Melting |
| A student rubs a soil between her fingers. It feels gritty/ rough. Why? | The sample has mineral particles in it. |
| What is the difference between erosion and weathering? | Weathering is the breakdown of rock into smaller pieces; erosion is when it is carried away. |
| Obsidian, granite, and basalt are rocks formed from molten rock that has cooled. What kind of rocks are they? | igneous |
| Which correctly matches the rock type with the process involved in forming the rock? Rock Type Process A. igneous - pressure and heat B. sedimentary - erosion and weathering C. metamorphic - heating and melting | B. sedimentary - erosion and weathering |
| A clastic rock is: | a rock formed from the cementation of transported rock fragments /grains/ pieces |
| Which one of the following features are NOT associated with sedimentary rocks? A. foliation B. fossils C. Crystals | A. foliation & C. Crystals |
| Process in which sedimentary rocks are arranged in layers is known as | Stratification |
| In regional metamorphism the source of increased temperature and pressure is _________ . | The increase in temperature with increasing depth of burial (Underground) |
| Which processes will cause metamorphism? | an increase in temperature an increase in pressure |
| Foliation is: | an alignment of mineral grains in a metamorphic rock. |
| Metamorphic rocks are classified according to: | texture - the presence/absence of foliation. (foliated or non foliated |
| When rocks are metamorphosed, the mineral components of the rock are: | Recrystallized-Transformed in the solid state. |
| Metamorphism begins with... | Rock=preexisting rock, igneous, sedimentary or metamorphic rock |
| Heat and pressure can transform igneous rocks into metamorphic rocks. What processes can transform igneous rock into sedimentary rock? | weathering, erosion, deposition , compaction, & cementation |
| What determines the size of grains in igneous rocks? | cooling rate of molten rock (magma or lava) |
| Extrusive rocks have small grains because they... | cools quickly or fast or rapidly |
| Compaction is... | the process that presses (pushes, compacts) sediments together |
| What often leads to the creation of metamorphic rocks? A. Volcanic eruption B. Movement of Earth's tectonic plates C. Erosion | B. Movement of Earth's tectonic plates |