Unveiling Earth's Dynamic Crust Through Plate Tectonics and Oceanic Discoveries

During WWII, scientists discovered mid-ocean ridges using echo technology, revealing underwater volcanoes. These ridges form as molten rock rises, creating new crust and pushing the Earth's crust apart. This process is part of plate tectonics, where the Earth's crust is divided into plates that move over the planet's surface. When plates collide, one may be forced downward, melting into magma and forming volcanoes. New crust is created at mid-ocean ridges and destroyed at ocean trenches, resembling a conveyor belt. Plate movements can cause earthquakes, like the 1906 San Andreas Fault event. Plates move about two inches per year, reshaping the Earth over time.

What technology did scientists use during World War II to discover underwater ridges?

• Sonar technology

• Echo technology

• Radar technology

• Infrared technology

What is formed at mid-ocean ridges?

• Mountain ranges

• Deep ocean trenches

• Desert landscapes

• New oceanic crust

What is the theory that explains the movement of the Earth's crust?

• Seafloor Spreading

• Volcanic Activity

• Plate Tectonics

• Continental Drift

What happens when two tectonic plates collide?

• They form a new ocean

• One plate may be pushed downward and melt

• They stop moving

• They create a desert

What natural event can occur when two plates nudge each other?

• A drought

• A hurricane

• A tsunami

• An earthquake

How much does the North American Plate move in one year?

• About two inches

• About two meters

• About two miles

• About two feet

What can the movement of tectonic plates lead to over long periods?

• Formation of deserts

• Creation of new species

• Reshaping of the Earth

• Increase in global temperatures