Use the term sea floor spreading to explain how a mid oceanic ridge forms.

Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. ... At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.