By Sally M. Walker
A part of a sequence, this e-book explores volcanoes and in addition examines the topic with regards to heritage, paintings, track, geography, language, arithmetic and lots of different elements of information and tradition.
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Extra info for Volcanoes (Early Bird Earth Science)
Mount Saint Helens erupted in 1980. A cloud of ash and rock rushed down the side of the mountain. 37 Some volcanoes are tall mountains. Their tops are covered with snow and ice. When these volcanoes erupt, heat from magma melts the snow. The snow becomes water. The water runs down the mountain. As it flows, it mixes with soil and rocks to make mud. The flowing mud is called a lahar (LAH-hahr). The lahar gushes down the sides of the volcano. It knocks down trees, buildings, and huge rocks. These houses were buried by rocks and sand that came from a volcano.
CHAPTER 4 ROCKS FROM VOLCANOES When lava comes out of a volcano, it cools and hardens. It becomes solid rock. Different kinds of lava become different kinds of rock. 32 One kind of lava rock is called basalt. The lava that erupts from volcanoes above hot spots usually hardens into basalt. The top of Earth’s crust under the oceans is made of basalt. Andesite (AN-dih-zyt) is another kind of lava rock. Andesite forms from thick magma. It often forms in places where one of Earth’s plates slides under another plate.
What is a crater? What are some kinds of rocks made by volcanoes? What is your favorite part of the book? Why? If the child has questions, don’t hesitate to respond with questions of your own, such as What do you think? Why? What is it that you don’t know? If the child can’t remember certain facts, turn to the index. INTRODUCING THE INDEX The index helps readers find information without searching through the whole book. Turn to the index on page 48. Choose an entry such as rocks from volcanoes and ask the child to use the index to find out why pumice rock floats.