ÔùÖ The Air Above ÔùÅ How did the atmosphere form? ÔùÅ How is the atmosphere divided? ÔùÅ Where does the atmosphere end? ÔùÅ What is the ozone layer? ÔùÅ What is the ionosphere? ÔùÅ What causes the aurora? ÔùÅ What are the Van Allen belts? ÔùÅ Why doesn't the sun burn Earth? ÔùÅ Why is the sky blue during the day but red at sunset? ÔùÅ Why is it colder on mounta…
ÔùÖ Rocks: A Historical Record ÔùÅ How are rocks formed? ÔùÅ How is igneous rock classified? ÔùÅ How are diamonds formed? ÔùÅ What happens to rock over time? ÔùÅ How do rocks show Earth's history?rnrnÔùÖ Harvesting Earth's Mineral Bounty ÔùÅ How are buried resources found? ÔùÅ Where do mineral deposits occur? ÔùÅ How do oil and natural gas form? ÔùÅ How is coal …
ÔùÖ This Majestic Planet ÔùÅ How did Earth form? ÔùÅ What is inside Earth? ÔùÅ What is the crust made of? ÔùÅ Is Earth heated from within? ÔùÅ How is Earth's interior studied? ÔùÅ How big is Earth? ÔùÅ Does Earth's gravity vary? ÔùÅ Why does a compass point north?rnrnÔùÖ Tectonic Movements ÔùÅ Are the continents moving? ÔùÅ Is there proof of continental drift…
ÔùÖ Moulding the Face of a Planet ÔùÅ How are mountains formed? ÔùÅ How are terraces created? ÔùÅ Can the sea invade the land? ÔùÅ What is a cuesta? ÔùÅ What made the Grand Canyon? ÔùÅ How were the Appalachians formed? ÔùÅ Why do rivers cross the Himalayas?rnrnÔùÖ Climate as a Force of Change ÔùÅ What causes landslides? ÔùÅ Can the wind create a desert? ÔùÅ W…
ÔùÖ Mapping Earth's Surface ÔùÅ How are maps made? ÔùÅ What do surveyors do? ÔùÅ How is position marked on maps? ÔùÅ What are the basic types of maps? ÔùÅ Who made the first maps? ÔùÅ What is a Mercator projection? ÔùÅ How are nautical charts made? ÔùÅ Why were time zones created? ÔùÅ How are computer maps made?rnrnÔùÖ Earth's Colossal Stonecutters ÔùÅ What l…