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Planet Earth Educator’s Guide Gottesman Hall of PLANET EARTH INSIDE • Map of the Hall • Essential Questions • Teaching in the Hall • Come Prepared Checklist • Correlation to Standards • Glossary ONLINE • Science & Literacy Activities • Additional Resources amnh.org/planet-earth-educators Essential Questions correspond to map locations; red terms are ESSENTIAL QUESTIONS defined in the Glossary How has Earth evolved? where and how the rocks formed. To determine their relative age, they observe sequences of layered rocks, Our solar system formed 4.7 billion years ago. Along and identity the fossils found in sedimentary rocks. with all the other planets, Earth was created from Some rocks can be dated radiometrically, which gives clouds of dust orbiting our infant Sun. Molten at first, their absolute age. All this information, combined with the planet differentiated into a molten iron core and geologists’ observations of processes operating today, a silicate outer layer—within a few tens of millions of makes it possible for them to reconstruct geologic years. Shortly thereafter the Moon formed, possibly history in order to deduce what happened long ago. from material ejected when a Mars-sized object smashed into early Earth. As Earth’s surface cooled enough for a new crust to solidify, water vapor and What causes climate and climate change? other gases were driven from the interior to form an Earth’s climate has been changing naturally over its ocean and atmosphere. By at least 3.5 billion years entire history. The significant, ongoing changes that ago, photosynthetic bacteria had evolved and began began in the middle of the 19th century, however, introducing oxygen into the ocean and atmosphere. are due to human activity. The major natural driver of After approximately 1.8 billion years, the atmosphere climate is the Sun: Because of Earth’s spherical shape, and ocean were saturated with oxygen. more solar radiation (sunlight) falls on equatorial regions than on the poles. This difference in heat causes Why are there ocean basins, mountains, the movement of many components of Earth’s climate and continents? system, including ocean and wind currents. Greenhouse gases in the atmosphere, including carbon dioxide Earth’s solid mantle ceaselessly churns. Convection (CO2), serve as an insulating layer, trapping the Sun’s transports heat from the deep interior to the surface heat. Human activity—particularly burning fossil fuels as hotter, less dense solid rock rises and cooler, for transportation, industry, and home energy—is now denser solid rock sinks. This slow churning drives plate causing atmospheric CO2 to increase rapidly, raising tectonics (the movement of rocky plates that make up global average temperatures. Because the components the solid shell of the planet), which forms ocean basins, of the climate system are interconnected, this rise in CO2 shifts continents, pushes up mountains, and causes and temperature has many effects. For example: sea ice volcanoes to erupt. Most earthquakes occur along the and glaciers are melting rapidly; dissolved CO2 is making margins of these plates. Wind and water also shape the ocean more acidic, affecting ocean life; sea levels are Earth’s surface. Over millions of years they wear down rising; and intense weather events, such as droughts and mountains and redeposit them as sediments, carving the severe storms, are becoming more frequent. These and landscapes we live in. other changes are affecting all life on Earth, including us. How do scientists read the rocks? Why is Earth habitable? All over the world, from ocean trenches to roadside Life on Earth is possible because its ideal distance outcrops and from riverbeds to mountaintops, from the Sun and balance of greenhouse gases allow geologists collect rocks. They observe their mineralogy for liquid water to exist on its surface. Early life, which and texture, and measure their composition to find out may have begun in the ocean, evolved with the planet The Grand Canyon over huge stretches of time. Energy and the elements tells a story of necessary for life circulate through the biosphere (the erosion by water and living portion of our planet), the atmosphere, the ocean, wind, with steep walls of hard rock and the solid Earth. Key biogeochemical cycles include and slopes of softer, the water cycle, carbon cycle, and rock cycle. Because more easily eroded of this cycling, there is oxygen in the air to breathe, sedimentary rock. an ozone layer to help block ultraviolet radiation, and relatively moderate surface temperatures that are conducive to life. MAP OF THE HALL Gottesman Hall of Planet Earth ESSENTIAL QUESTIONS 5E. 5G. Mountain Formation Section Earthquakes Section How has Earth evolved? 5F. Model of Plates Moving Past Each Why are there ocean Other basins, mountains, and PLATE continents? TECTONICS 5H. Model of Plates Separating How do scientists read 5B. Convection Section the rocks? 5I. Basalts 5C. Model of Plates What causes climate and Colliding 5J. Hawaiian Hot Spots climate change? Why is Earth habitable? 2E. Grand Canyon Section 5D. Explosive Volcanism Section 2A. Cast of Rock Outcrop from Scotland 1C. Banded Iron and Stromalite 5A. 2B. Dike in Granite Bronze 1B. Four Density Blocks Globe HOW EARTH THE ROCK 2C. Three Types FORMED RECORD of Rock 1A. Meteorites enter 2D. Gabbro and Vials Dynamic Dynamic Earth Earth Sphere Video 3C. Carbon Cycle Diagram 4A. 4C. Water Cycle Diagram Groundwater CLIMATE AND Video CLIMATE CHANGE 2F. Granite, Claystone, Gniess, and Rock Cycle Diagram 1D. Sulfide Chimney and Banded Ore 3B. Paleoclimate 4B. Ore Specimens Section 3A. Interactive Climate and Climate Change Wall NATURAL RESOURCES enter bla Numbers correspond TEACHING IN THE HALL to map locations to explore the way these two rocks formed and what this tells DYNAMIC EARTH us about the early atmosphere. • VIDEO: Over billions of years, the Sun’s energy, 1D. Sulfide Chimney (#28) and Banded Ore (#26): Earth’s rotation, and heat from the planet’s interior Chimneys form today when iron and other metals transformed a molten ball into a planet with oceans from underwater hot springs react with seawater and and continents hospitable to life. Over tens of precipitate, in this case as sulfide minerals. millions of years, colliding tectonic plates push up Walk past the Dynamic Earth Sphere to observe the chimneys mountain ranges. Over minutes and even seconds, at the other end of the hall. Have students examine the tornadoes form and earthquakes reshape the land- “Deep-Sea Vents and Ore Deposits” panel and discuss the scape. Have students watch this three-minute video way these two very different ore deposits formed. for an overview of how Earth is constantly changing. • SPHERE: Suspended from the ceiling, it recreates a 2 THE ROCK RECORD view of Earth from space. Watch the layers of clouds, 2A. Cast of Rock Outcrop from Scotland: One way geologists vegetation, ice, and ocean peel away to reveal the learn about Earth’s history is to interpret the structure of underlying rocky surface. rock formations. In general, sedimentary rocks are deposited in horizontal layers, and younger beds lie atop older ones. Have students examine this cast to identify and observe its 1 HOW EARTH FORMED two main rock types and to infer what they tell us about the formation of this part of Earth’s crust. At the bottom are 1A. Meteorites (#1-3): The most important clues to the vertical layers of gray slate which had been deposited in water. composition of the early solar system come from meteorites. These must have been uplifted, tilted, and eroded. The dark Have students observe these three meteorites and discuss the red, horizontal layers of sandstone were later deposited on the evidence about Earth’s formation that they contain. eroded surface. Tell students that this boundary represents a discontinuity, or gap in time, in processes that occurred over 1B. Four Density Blocks (#4-7): When Earth was forming, millions of years. heavier materials like iron sank to the center to form the core and lighter ones like silicates rose to the surface. Have students take turns lifting the samples and exploring the diagrams. Ask them to connect this experiment to how A Earth’s layers are organized. C 1C. Banded Iron (#23, 15) and Stromatolite (#14): Rocks can contain important clues about the atmosphere. B In early Earth, metals like iron were released into the ocean from hot springs but remained in solution in the water. When photosynthetic organisms began producing oxygen, it reacted with the iron in the seawater and precipitated as The dike in granite (B) and three types of rocks (C) are silhouetted against a iron oxide to form the banded iron formation. Eventually, cast of the famous Scottish outcrop (A) known as Hutton’s Unconformity. oxygen began to accumulate in the atmosphere. Have students observe 2B. Dike in Granite (#3): Dikes are planar bodies of once- both banded iron molten rock that intruded across the layering of older rocks. formations and the Have students examine this sample and identify which rock stromatolite (the formed first. fossilized remains of early oxygen-producing 2C. Three Types of Rocks (#4-12): Geologists use different microbes). Ask them to characteristics to categorize rocks. use the “How Do We Have students read about sedimentary, igneous, and meta- Know About the Early morphic rocks on the panel and connect these characteristics Atmosphere?” diagram to what they observe about the rocks on display. 2D. Gabbro and Vials (#16): Geologists can date some rocks 3B. Paleoclimate Section: Evidence of Earth’s past climate radiometrically by chemically analyzing them in the lab. can be found in a variety of natural records. These records Have students examine the mineral reveal that carbon dioxide and warming are closely linked, grains in the vials and the related panel and that atmospheric CO2 is now higher than at any time in to learn about half-life and radioactive the past 800,000 years or more.
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