Science Common Sense

1558 - What are the main theories proposed by scientists to explain a dynamic solid Earth?

There are a few main theories proposed by scientists to explain a dynamic solid Earth. These theories are:

1. Continental Drift Theory (CDT): This theory says that continents were once joined together in a single landmass and then moved apart over millions of years.

2. Seafloor Spreading Theory (SST): This theory explains how new oceanic crust is created at mid-ocean ridges and then moves away from the ridge.

3. Plate Tectonics Theory (PTT): This is the most widely accepted theory, which combines CDT and SST. It says that the Earth's crust is broken into large plates that move, sometimes colliding and sometimes moving apart.

These theories explain why earthquakes happen, why mountains form, and why volcanoes erupt.