A big idea for second grade science is that wind and water can change the shape of the land. We started this unit by investigating rocks, as these explorations allowed us to develop our observing and recording skills. We are now going to start focusing on the idea that rocks, and the Earth's surface, can change. Water is a powerful force that reshapes the earth’s surface. Students will come to see that water isn’t just something we drink. It carries sand to create beaches, carves out canyons and valleys and, as ice, scrapes entire areas flat. Today students developed a model of the earth’s surface and used it to discover an important principle about how rivers work and why they flow.
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