Key Idea.
Section 1
The Imperceptible Creep
To a human observer, the ground feels stationary. However, tectonic plates are continuously creeping across the planet's surface.
The rate of this motion is incredibly slow, averaging only a few centimeters per year—roughly the speed at which fingernails grow. Because this change is so gradual, it takes millions of years for continents to move noticeable distances.
Section 2
GPS Technology Evidence
Since humans cannot feel this slow motion, scientists rely on technology. The Global Positioning System (GPS) allows for precise measurements of Earth's surface.
By placing GPS receivers on different plates and tracking their positions over years, scientists obtain hard data. This GPS evidence proves that the plates are indeed moving and allows us to calculate exactly how fast and in what direction they are traveling.
Expand to review the lesson summary and core properties.
Section 1
The Imperceptible Creep
To a human observer, the ground feels stationary. However, tectonic plates are continuously creeping across the planet's surface.
The rate of this motion is incredibly slow, averaging only a few centimeters per year—roughly the speed at which fingernails grow. Because this change is so gradual, it takes millions of years for continents to move noticeable distances.
Section 2
GPS Technology Evidence
Since humans cannot feel this slow motion, scientists rely on technology. The Global Positioning System (GPS) allows for precise measurements of Earth's surface.
By placing GPS receivers on different plates and tracking their positions over years, scientists obtain hard data. This GPS evidence proves that the plates are indeed moving and allows us to calculate exactly how fast and in what direction they are traveling.