Parts of a Volcano stage 4 Comp - Comprehension Pack.pdf

Parts Of A Volcano STAGE 4 Unit focus: Volcanoes Text focus: Information Text Volcanoes come in many shapes and sizes but they all have most...

Parts Of A Volcano STAGE 4 Unit focus: Volcanoes Text focus: Information Text Volcanoes come in many shapes and sizes but they all have most ASH CLOUD of the same features. Some are too big to see from the ground. Ash, rock and pumice are thrown high into the air during an eruption. Yellowstone Park in North America is actually the crater of an The ash cloud was 20 miles high and entered the stratosphere when Mt. enormous supervolcano. Most of the actual volcano is underground. Vesuvius erupted in 79 AD. Ash particles are very small and can travel a The last time it erupted was over 640,000 years ago. significant distance in the wind. Other volcanoes are more recognisable: a mountain with a crater on the top. Some have more than one crater, as craters can form around CRATER The crater of a volcano is the opening caused by volcanic the slopes of the volcano. activity. It is normally formed the first time a volcano erupts and is found at the end of a vent. During an eruption, magma rises out of the craters. Pressure builds up when VENT All volcanoes have a central vent. This is the opening a crater is blocked which results in an explosive eruption. that allows magma to travel from underneath the These can be much more dangerous. Earth’s crust to the crater. PARASITIC CONE LAVA FLOW A parasitic cone forms when magma Magma becomes lava once it reaches the breaks through the surface of the volcano Earth’s surface. Lava forms igneous rocks, somewhere other than the main crater. such as granite or basalt, as it cools. A ding ro Rea und all resources ©2019 Literacy Shed e um C u r r ic ul Th http://www.literacyshedplus.com  RETRIEVAL FOCUS 1. Which type of volcano is Yellowstone Park? 2. Which volcano formed an ash cloud 20 miles high when it erupted? 3. Which type of vent do all volcanoes have? 4. When is a crater normally formed? 5. Find an example of a type of igneous rock. VIPERS QUESTIONS S How does a parasitic cone form? V Find a word which means that something is easy to identify. S When does magma become lava? V What impression does the use of the prefix super in supervolcano give you? E How has the author used the layout to engage the reader? all resources ©2019 Literacy Shed http://www.literacyshedplus.com