Lesson 2 Quick Changes to Earth’s landscape – We learned that geologists study land from soil to landforms. We looked at Bryce Canyon and the hoodoos. We learned that some events happen very quickly while others occur very slowly over time. Earthquakes, landslides, floats, and volcanoes can change Earth’s landscape very rapidly. Earthquakes produce seismic shaking or ground vibrations, liquefaction (stable soil suddenly turning liquid), landslides, mud flows, and tsunamis which are giant waves. If the earthquake is intense the damage can be quite severe. California experiences about 10,000 earthquakes each year and Alaska experiences 12,000 each year.