Earth

 

+ PLANET EARTH
HOW WAS EARTH FORMED?
IS EARTH THE SAME ALL THE WAY THROUGH?
HOW DOES EARTH SUPPORT LIFE?
HOW DOES EARTH MOVE THROUGH SPACE?
SEASONS
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+ EARTH SCIENCES
WHY IS EARTH SCIENCE USEFUL?
HOW DO EARTH SCIENTISTS WORK?
GEOLOGY
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+ CONTINENTS
HAVE EARTH’S CONTINENTS ALWAYS LOOKED THE SAME?
WHY DO EARTH’S CONTINENTS MOVE?
BIOGRAPHY: ALFRED LOTHAR WEGENER GERMAN, 1880–1930
TECTONIC PLATES
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+ OCEANS
OCEAN LIFE
SUNLIT ZONE
TWILIGHT ZONE
DEEP-SEA ZONE
WHY IS THE SEA SALTY?
WHAT CAUSES THE OCEAN CURRENTS?
OCEAN FLOOR
WAVES
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+ ISLANDS
WHAT IS A CONTINENTAL ISLAND?
HOW ARE VOLCANIC ISLANDS FORMED?
HOW DO CORAL REEFS FORM?
FORMATION OF A CORAL ATOLL
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+ EARTHQUAKES
WHAT CAUSES EARTHQUAKES?
WHAT HAPPENS DURING AN EARTHQUAKE?
WHERE DO MOST EARTHQUAKES STRIKE?
HOW ARE EARTHQUAKES MEASURED?
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+ VOLCANOES
HOW DOES A VOLCANO ERUPT?
ARE ALL VOLCANOES DANGEROUS?
LAVA
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+ MOUNTAINS
HOW ARE MOUNTAINS FORMED?
ARE MOUNTAINS STILL GROWING?
WHY ARE MANY MOUNTAINS SNOW-CAPPED?
MOUNTAINS AT SEA
RANGES
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+ ROCKS
THE ROCK CYCLE
WHAT ARE IGNEOUS ROCKS?
WHAT ARE SEDIMENTARY ROCKS MADE OF?
HOW ARE METAMORPHIC ROCKS CREATED?
MINERALS
CRYSTALS
GEMSTONES
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+ SOIL
HOW IS SOIL FORMED?
ARE THERE DIFFERENT TYPES OF SOIL?
HOW DO LIVING THINGS HELP THE SOIL?
SOIL LAYERS
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+ ATMOSPHERE
DOES THE ATMOSPHERE REMAIN THE SAME FROM EARTH TO SPACE?
WHAT IS ATMOSPHERIC PRESSURE?
FIVE ATMOSPHERE LAYERS
OZONE LAYER
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+ WEATHER
WHAT CAUSES THE WEATHER?
FORECASTS
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+ WINDS
WHY DO WINDS BLOW?
WHAT FORCES AFFECT THE WORLD’S WINDS?
GLOBAL WINDS
MONSOONS
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+ RAIN
WHY DOES IT RAIN?
DO SOME PARTS OF THE WORLD RECEIVE MORE RAIN THAN OTHERS?
THE WATER CYCLE
CLOUDS
SNOW
HAIL
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+ STORMS
WHAT CAUSES LIGHTNING?
WHAT CAUSES THUNDER?
HURRICANES
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+ EROSION
HOW DOES EROSION HAPPEN?
LANDSLIDES
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+ RIVERS
HOW DO RIVERS BEGIN?
WHAT IS A RIVER’S LOAD?
HOW DO RIVERS SHAPE THE LANDSCAPE?
WHAT IS AN ESTUARY?
HOW ARE DELTAS FORMED?
LAKES
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+ CAVES
HOW ARE CAVES FORMED?
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+ ICE
HOW DO GLACIERS FORM?
WHAT ARE ICE CAPS?
ICEBERG
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+ COASTS
HOW DO WAVES CHANGE COASTAL LANDSCAPES?
TIDES
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+ ENERGY RESOURCES
WHAT IS FUEL?
FOSSIL FUELS
NUCLEAR ENERGY
RENEWABLE ENERGY
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+ CLIMATE
WHAT AFFECTS AN AREA’S CLIMATE?
WHY DO TROPICAL REGIONS HAVE HOT CLIMATES?
WHAT IS A CONTINENTAL CLIMATE?
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+ CLIMATE ZONES
CLIMATE ZONE CLASSIFICATION
WHAT IS A MICROCLIMATE?
HAS THE EARTH’S CLIMATE CHANGED OVER TIME?
WILL EARTH’S CLIMATE CHANGE IN THE FUTURE?
BIOGRAPHY: LOUIS AGASSIZ Swiss, 1807–1873
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+ HUMAN IMPACT
HOW DOES FARMING CHANGE THE LANDSCAPE?
HOW DOES INDUSTRY AFFECT THE LANDSCAPE?
WHAT CHALLENGES FACE THE HUMAN POPULATION?
POLLUTION
GLOBAL WARMING
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+ FARMING
WHICH KINDS OF ANIMALS ARE DOMESTICATED?
HOW HAVE MODERN CROPS BEEN DEVELOPED?
WHAT ARE STAPLE FOOD CROPS?
WHERE IS RICE GROWN?
MECHANIZED FARMING
WHAT IS ORGANIC FARMING?
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+ FISHING
WHAT IS OVERFISHING?
WHAT METHODS ARE USED BY THE FISHING INDUSTRY?
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+ FORESTRY
WHAT ARE THE MAIN USES OF TIMBER?
WHAT IS DEFORESTATION?
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