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Three Types of Rocks (Grade 5)

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Three Types of Rocks

Instructions: Read the information about each of the three types of rocks. Then, complete each statement and answer the questions.

Sedimentary RockIgneous RockMetamorphic Rock
Rock - Sedimentary - Conglomerate
Rock - Igneous - Basalt
Rock - Metamorphic - GneissGneiss
Sedimentary rocks form from silt, sand, rock pieces, and even plant and animal remains. These particles, or sediment, get compacted and cemented together into a rock. Sedimentary rocks can also form when minerals in water crystallize. Sedimentary rocks are the most common types of rocks found on the earth's surface where water and wind create pieces of sediment. Often, they form as layers of rock when younger sediment forms on top of older sediment.Igneous rocks form when molten earth material cools and hardens. Magma deep within the earth can slowly cool over millions of years. During this time, mineral crystals grow large and form igneous rocks. Lava on the earth's surface can also cool and form igneous rocks. Lava cools quickly, so these rocks usually have small or no mineral crystals. Most of the earth's crust is made of igneous rocks.Metamorphic rocks form from heat and pressure. Bury a preexisting rock deep enough in the earth and it will change into a metamorphic rock. Faulting from movement of tectonic plates can change rocks into metamorphic rocks. Sedimentary, igneous, and even metamorphic rocks can change into metamorphic rocks. But, if they melt, they will not form metamorphic rocks. They will form igneous rocks instead!

All rock types can become metamorphic rocks.
  1. True
  2. False
Igneous rocks form only above the Earth's surface.
  1. True
  2. False
Metamorphic rocks are formed by bits of rock combining together.
  1. True
  2. False
All rocks Earth's surface can weather and become sediments.
  1. True
  2. False
Igneous rocks can be formed by volcanoes.
  1. True
  2. False
Silt, sand, rock pieces and plant remains are all examples of                                     .
The most common type of rock found on earth's surface is                                    rock.
If a rock melts, then hardens, it forms a(n)                                      rock.
Metamorphic rocks form when rocks change because of heat and                                     .
The most common type of rock found on earth's surface is                                      rock.
When molten rock cools slowly, the crystals that form in the igneous rock are                 .
When molten rock cools quickly, the crystals in the igneous rock that form are                 .
Which type of rocks are pressed and cemented together?
  1. igneous rock
  2. fossils
  3. sedimentary rock
  4. metamorphic rock
What type of rock is created from lava?
  1. metamorphic
  2. igneous
  3. sedimentary
Which best classifies the rock shown?
Rock - Metamorphic - Gneiss
  1. igneous
  2. sedimentary
  3. metamorphic
Which best classifies the rock shown?
Rock - Sedimentary - Conglomerate
  1. igneous
  2. sedimentary
  3. metamorphic
Melted rock that is beneath Earth's surface is called                .
  1. magma
  2. lava
  3. sediment
  4. sand
Declan observed a rock that he found at the beach. The rock felt hard, it was yellow, and appeared to be made in layers. Declan concluded that the rock was sedimentary. Which observation BEST supports this conclusion?
  1. the yellow color
  2. the layers within the rock
  3. the hardness of the rock
  4. the location where the rock was found
Granite forms when liquid magma slowly cools within Earth's crust. If the granite is exposed to intense heat and pressure, it can change to gneiss. Which type of change takes place when granite turns into gneiss?
  1. Sedimentary rock changes into igneous rock.
  2. Igneous rock changes into metamorphic rock.
  3. Metamorphic rock changes into igneous rock.
  4. Sedimentary rock changes into metamorphic rock.
Rocks are classified by
  1. how they are formed.
  2. when they are formed.
  3. where they are formed.

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