Exploring our Physical World
To develop a sense of place we need an understanding of the Earth itself – the ground beneath our feet, the air we breathe, the water that fills our lakes, streams and oceans and the other living things that share our planet. We’ll look at the Earth’s geosphere when we study rocks and erosion, at the atmosphere when we learn about the blanket of air that surrounds us, and at the hydrosphere when we learn about the water cycle, winds, clouds, and weather. Throughout we’ll consider the biosphere, the living things in our world, and how they interact with the other components.
Our exploration starts with the sun, the engine that powers Earth’s major systems. In Sunlight and Shadow we’ll see how and why we experience day and night and the seasons, and we’ll consider how sunlight supplies the energy for photosynthesis, fuels the water cycle, and provides the right conditions for life. Beginning our study of the geosphere, in Erosion we’ll look at the process of erosion that has shaped and formed the Earth’s landforms over time by wearing away and carrying away rocks, soil, sand, and sediments, and depositing them in new places. We’ll look at how gravity, water, wind, and ice change the land, and we’ll consider the impact humans have as well. In Rocks and Minerals we’ll study the Earth’s crust, looking at rocks and learning how they’ve been formed and reformed, and at fossils, considering how they tell us about organisms and conditions in the past. We’ll examine minerals, testing their different properties as we try to identify them, and look at rocks we find outside for evidence of how they were made and how far they’ve traveled. Continue reading Earth