Earth's Forces
<div>The process in which wind, water, ice, or other things move pieces of rock and soil over Earth's surface.</div>
<div>Soil, sand, and rocks are always moving from one place to another.</div>
<div>Volcanoes can sit quietly for hundreds and thousands of years. And then one day – BOOM! They produce a fiery, noisy explosion. You may be surprised to know that there are many different types of volcanic activities. Explore volcanoes!Standards</div>
<div>Physical weathering wears down rocks, breaking them into smaller pieces. Grains of sand that are carried by wind scrape the surface of rock. Waves wear down the rocks that they crash upon. Water enters the cracks in rocks. When the temperature decreases, this water freezes. Water expands as it freezes. Rocks break apart along the larger cracks.</div>
<div>Volcanoes are forces that can reshape Earth in a few hours or over many years.</div>
<div>Journeys with biologist Liz Bonnin and geologist Martin Pepper to the islands of Indonesia to investigate the Krakatoa volcano. The scientists analyze volcanic rock samples, examine ocean floor topography, and visit sulfur mines to better understand the power of past volcanic eruptions. With Krakatoa rising yet again from the sea, the program seeks to document the global consequences of another cataclysmic eruption.</div>
<div>Students travel with a geologist and explore Earth. The geologist performs simple tests identifying minerals found in rocks, such as quartz. The rock cycle as well as properties and characteristics of the different types of rocks are discussed.</div>
<div>The Earth is changing constantly. Have you ever made a sand castle on a beach and watched it disappear in the waves? That’s erosion! Erosion moves materials and deposits them in other places. Erosion and deposition can be very slow processes. Let’s explore how erosion and deposition can cause changes.</div>
<div>Read how fossils are formed by layers of rock and earth.</div>
<div>Click here to view the complete lesson plan.</div> Discovery Education and Thinglink
<div><b>Student Assignment</b>: Use content from Discovery Education Science to create a Google Presentation describing how these forces change the shape of the Earth's surface.</div> Earth’s Changing Surface What causes the Earth to change its shape?
<div>Everyday natural forces like wind, water, ice, and even growing plants wear away rocks. This is called mechanical weathering. See if you can identify the cause of mechanical weathering in different land formations.</div>
<div>If you have ever felt the ground shaking, you have probably experienced an earthquake. An earthquake lasts a few seconds but can cause great damage. Let’s find out more about earthquakes.</div>

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