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Ch 9 Volcanic Eruptions 7th Grade Section 1

Across
The ash from an explosive eruption can reach the upper parts of the Earth’s atmosphere. It can stay there for years, blocking sunlight and causing the climate to get cooler. (152)
A pyroclastic ______ is a dangerous type of volcanic flow. Pyroclastic flows form when ash and dust race down the side of a volcano like a river. (155)
________ are small bits of lava that harden before they hit the ground. (155)
The explosive eruption of Mount St. ________ in 1980 caused an entire side of a mountain to collapse.
__________ volcanic eruptions are the most common type of eruption. (152)
the body of molten rock that feeds a volcano (vocab)
an opening at the surface of the Earth through which volcanic material passes (vocab)
Volcanic ________ are large blobs of lava that harden in the air. (155)
The main factor affecting an eruption is the __________ of the magma. (Top Page 153)
Down
________ is a compound made of the elements silicon and oxygen. (153)
_________ is lava that forms a thin, flexible crust as it cools. The crust wrinkles as the lava moves underneath it. (154)
Geologists classify pyroclastic material by the _______ of its pieces. (Bottom Page 154)
__________ material is hardened magma that is blasted into the air. (1544
a vent or fi ssure in the Earth’s surface through which magma and gases are expelled (vocab)
When magma flows onto the Earth’s surface, it is called ______. (151)
Melted rock. (151)