photo.jpg

# Geological Events and their Significance ### Geological Events: - Seismicity - Volcanism - Mountain formation - Mountain Ranges ### Features: - Earthquake - Epicenter - Volcanoes ### Instruments and Resources: - Seismograph - Seismogram - Seismologist ### Divergent Plate Boundaries - Two plat...

# Geological Events and their Significance ### Geological Events: - Seismicity - Volcanism - Mountain formation - Mountain Ranges ### Features: - Earthquake - Epicenter - Volcanoes ### Instruments and Resources: - Seismograph - Seismogram - Seismologist ### Divergent Plate Boundaries - Two plates move apart - Also called "Constructive plate boundary" - Causes rift valleys and oceanic ridges to form ### Rift Valleys - Deep faulted structures found along the axes of a divergent plate boundary - Surrounded by mountains and water - An example is the Red Sea ### Mid-Ocean Ridge - The most extensive chain of mountains on Earth, stretching nearly 65,000 km (40,390 miles). - More than 90 % of the mountain range lies in the deep ocean - Example: East Pacific rise - Diverging movement at these ridges occurs at rates from 75 mm/year (fastest) to 7 mm/year (slowest), with 7 mm/year occurring at the Southwest Indian Ridge.