| A | B |
|---|
| type of rock formed when lava cools very quickly | extrusive |
| Explosive eruptions come from what type of volcanoes? | cinder |
| Liquid rock that is inside the Earth | magma |
| The neck of a volcano that connects the crater to the magma chamber | conduit |
| This volcano in Washington erupted in the early 1980s | Mt. St. Helens |
| The Hawaiian Islands are examples of | shield volcanoes |
| Felsic rocks are what color? | light colored |
| Extrusive rocks are formed when | lava that reaches the Earth's surface hardens |
| 3 benefits of volcanoes | good farmland, geothermal energy, new deposits of minerals, water vapor |
| 3 clues a volcano might erupt | gas & smoke from the volcano, small earthquake nearby, a bulge in the ground near a volcano |
| Rock type formed from magma or lava | igneous |
| 3 places volcanoes can occur | hot spots, subduction zones, divergent zones |
| Yellowstone National Park & Hawaiian Islands were formed over | hot spots |
| type of rock formed when magma cools inside the Earth | intrusive |
| Coarse-grained rocks (large crystals) form when molten magma cools | slowly |
| This igneous rock makes up the oceanic crust | basalt |
| This felsic igneous rock floats in water | pumice |
| This igneous rock is extrusive, with no grain, cools very quickly | obsidian |
| Most abundant rock on earth | balsalt |
| volcanic glass | obsidian |
| This igneous rock is used for monuments & statues | granite |
| Made of alternating layers of lava and rock particles | composite |
| Hawaiian Islands are formed from this type of volcanoc | shield |
| Paracutin, Mexico is an ex. of this type of volcano | cinder |
| Made of only rock and ash | cinder |
| Made of layers of lava | shield |
| Texture of rocks that have poskets of air or holes | porous |
| Volcano that destroyed Pompeii in 79 AD | Mt. Vesuvius |
| Large, rope-like, runny masses of lava | pahoehoe |
| Jagged, sharp pieces of lava | aa |
| The holes in volcanic rock occur by what escaping | gas |
| The size of crystals in igneous rock depends mainly on | the cooling rate |
| A volcano that is sleeping (Mt. Ranier in Washington) | dormant |
| A volcano that is currently erupting (Kilauea, Hawaii) | active |
| How are igneous rocks classified | composition & texture |
| This material is carried the farthest by wind after an eruption | volcanic ash |
| This feature is left after an extinct volcano erodes away | volcanic neck |
| the large opening at the top of a volcano | crater |
| liquid rock that has not reached the Earth's surface | magma |
| A volcano that is not expected to erupt again (Mt. Rogers) | extinct |
| The Ring of Fire includes what western states | California, Oregon, & Washington |
| An example of a coarse-grained igneous rock | granite |
| Characteristics of intrusive rocks | magma beneath the Earth's surface hardens slowly to form coarse-grained rocks with visible, large crystals(ie granite,pegmatite) |
| Characteristics of extrusive rocks | lava reaches the surface of Earth, cools quickly, small crystals, fine grained and glassy rocks (obsidian, basalt) |
| Name 2 negative effects of volcanoes | lava incinerates everything in its path, puts huge amts of dust and ash polluting the air for many miles |
| area exposed by volcanic dust and ash | Because dust/ash are very fine grained, wind can carry it many miles even completely around the world |
