Earthquakes and Volcanoes

Fill in the gaps using the words below. Seismic waves are caused by earthquakes. They start inside Earth from a point called the focus. The point above this on Earth’s surface is called the epicenter. Seismic waves are detected using a seismometer. There are two types of seismic wave – (in alphabetical order) longitudinaland transversewaves. P waves are called primarywaves. They are longitudinaland can travel through (in alphabetical order) liquidsand solids. S waves are called secondarywaves. They are transverse and can travel through solids but not through liquids. Define"pyroclastic flow" Label the structure of the volcano. lava flow secondary vent magma lava magma chamber main vent t crater Using the image below, explain how island arcs are formed. Use this image to answer the 3 questions below it. A) Where on the tectonic plates do most volcanoes form?B) Explain why Australia does not have any active volcanoes.C) Explain what the Pacific Ring of Fire is. Draw and describe the formation and travel of a tsunami. Define "volcano". Fill in the labels below to show the important parts of how earthquakes form Use the words: epicentre, focus, plate movement, seismic waves focus epicenter plate movement seismic waves Match the terms below to their correct descriptions. Earthquake the rapid movement of the ground, usually back and forth and up and down in a wave motion due to the movement of tectonic plates Lava molten rock that has erupted onto the Earth’s surface Magma molten rock below the Earth’s surface Pyroclastic flow a cloud of ash, rock and gas at about 500°C that exits from a volcano like an avalanche Tsunami a huge wave in the ocean caused by an earthquake occurring on the seafloor Seismic wave the shaking, wave-like movement of the ground in an earthquake Match the words below to their definitions by dragging them to each other. Click the link above to practice your vocabulary. Make sure you change the "answer with" box to "term"instead of "definition".