Igneous Rocks
An igneous rock has a large amount of feldspar. Feldspar can be used to classify the rock based on which characteristic? age composition origin texture
b
Which minerals are commonly found in igneous rocks? Check all that apply. halite feldspar gypsum mica quartz
b d e
How are extrusive rocks formed? Magma gets trapped inside Earth and cools to rock. Volcanoes apply force to solid rocks and eject them. Magma gets forced to Earth's surface and cools to rock. Volcanoes trap lava inside Earth, where it cools to rock.
c
How do intrusive rocks form? Lava cools slowly outside a volcano. Magma cools slowly inside a volcano. Molten material is cooled quickly by water. Magma is ejected into the air and cools slowly.
c
Which property is used to identify the origin of an igneous rock? color density hardness crystal size
d
An igneous rock has small, dark crystals. Which statement also accurately describes this rock? It is an intrusive rock. It has a coarse texture. It was found on Earth's surface. It was formed from slow cooling.
not a
Which feature is used to classify a rock based on its composition? the origin of the rock the texture of the rock the types of minerals in the rock the shapes of the crystals in the rock
not b
Which type of rock forms when molten material cools and hardens inside Earth? an igneous rock an extrusive rock a rock with fine texture a rock with small crystals
not b
Which features of igneous rocks are determined by their cooling rate? Check all that apply. color shininess hardness crystal size rock texture
not d and c
An igneous rock is found on the ground and has no identifiable crystals. What is the most likely origin of this rock? molten material that cooled slowly molten material that cooled quickly rock that was eroded by surrounding rocks rock that was exposed to extreme pressure
A
Which materials form igneous rocks upon cooling? Check all that apply. lava magma crystals intrusive rocks sediment from rocks
A B
An igneous rock has a large amount of feldspar. Feldspar can be used to classify the rock based on which characteristic? age composition origin texture
B
How are rocks that cooled within magma chambers found on Earth's surface today? They are pushed up by magma under Earth's surface. They are revealed by erosion of Earth's surface over time. They are pushed to Earth's surface because of their larger size. They are revealed at Earth's surface due to their low density.
B
Which minerals are commonly found in igneous rocks? Check all that apply. halite feldspar gypsum mica quartz
B C D
Which trait is common to rocks formed from magma trapped inside a volcano? less dense fine crystals coarse texture quickly cooled
NOT B or a
An igneous rock has small, dark crystals. Which statement also accurately describes this rock? It is an intrusive rock. It has a coarse texture. It was found on Earth's surface. It was formed from slow cooling.
NOT D
An igneous rock is light in color and has extremely coarse grains. What is the most likely origin of the rock? a magma chamber the bottom of the ocean an outer slope of a volcano the shore of a volcanic island
a
Which materials form igneous rocks upon cooling? Check all that apply. lava magma crystals intrusive rocks sediment from rocks
a b
Which phrases describe igneous rocks that cool quickly during formation? Check all that apply. small crystals coarse surfaces formed from lava found on Earth's surface exposed after erosion occurs
a c d
