Convection currents in the Earth's interior are thought to cause folding and mountain building by dragging tectonic plates. Convection currents are driven by heat from the Earth's core, radioactive decay in the mantle and crust, and cooling of the mantle. Mapping of rock formations and magnetic reversals at ocean ridges provided evidence that supports plate tectonics and convection currents driving the movement of plates.

1. CONVECTION CURRENTS
CLASS: L
BY: YALIZET A. S.

2. THEORY OF CONVECTION CURRENTS?
• which younger rocks became buckled to form the landforms,
the convection-current theory, in which convection currents in
the Earth’s interior dragged the crust to cause folding and
mountain making.

3. WHO THOUGHT OF THIS THEORY?
• I think suggests that flow in the mantle is induced by convection currents which drag and move the
lithospheric plates above the asthenosphere. Convection currents rise and spread below divergent
plate boundaries and converge and descend along convergent. Three sources of heat produce the
convection currents:like
• (1) cooling of the Earth's core
• (2) radioactivity within the mantle and crust
• (3) cooling of the mantle

4. MAGNETIC REVERSALS & SEAFLOOR SPREADING EVIDENCE.
• also permitted more detailed mapping of the ocean floor and continental
margins. A much better fit between the rifted continents is apparent when
the shape of the continental slope is used instead of the continent's
shoreline. Detailed mapping of distinctive rock units that extend out to sea
along the South American and African coasts and North American and
British coasts has shown that they would converge perfectly if the
continents could be fitted together.

5. EPLAINED THE DIAGRAMA..
• The hot air near to the radiator expands and increases
• in volume. Hot air expands because the particles move
• further apart as they get hotter
• This makes the density of the hot air decrease and it starts
• to rise upwards. The colder air above it gets pushed along
• to the right and then circulates as shown by the arrows.