Earth History
How do we know the Earth has changed?
Earthquakes
What is and earthquake? What is a fault? What is the focus of an earthquake? What is the epicenter of an earthquake? What is a seismograph used for?
What causes earthquakes?
What causes earthquakes?
Volcanoes
What is a volcano? What is magma? What is lava? What is a crater? What are tectonic plates? What is a magma chamber?