✓ Accepted Answer
The human brain contains roughly 86 billion neurons connected by about 100 trillion synapses — connections between neurons. Information travels as electrical impulses along neurons and chemical signals across synapses.
Different regions specialise in different functions. The prefrontal cortex handles planning, decision-making, and personality. The hippocampus forms and retrieves memories. The amygdala processes emotions, particularly fear. The cerebellum coordinates movement and balance. The brainstem controls basic survival functions like breathing and heart rate.
Memory isn't stored in one location but distributed across networks. Long-term memories form through synaptic strengthening — when neurons repeatedly fire together, their connections strengthen, which is why practice and repetition improve memory. Sleep is critical for consolidating memories from short-term to long-term storage.
The brain is remarkably plastic, especially in youth. It reorganises in response to experience and learning. Neuroplasticity continues in adulthood, though more slowly. This is why learning new skills at any age remains beneficial and why stroke rehabilitation can be effective.
by sophiewhite3836
· 64 upvotes
Earthquakes occur when stress accumulated along geological fault lines is suddenly released. Tectonic plates — the massive sections of Earth's crust — are constantly moving, typically a few centimetres per year. Where plates meet, they grind against each other. Friction prevents smooth sliding, so stress builds up over decades or centuries until it releases catastrophically.
The point underground where the earthquake originates is the hypocentre (or focus). The point on the surface directly above is the epicentre, which is what news reports refer to. Seismic waves radiate outward in all directions from the hypocentre.
The Richter scale and more modern moment magnitude scale measure energy released. The scale is logarithmic — a magnitude 7 is about 32 times more energy than a magnitude 6. A magnitude 9 releases about 1,000 times more energy than a magnitude 7.
Earthquakes are concentrated along plate boundaries: the Pacific Ring of Fire (Japan, Indonesia, Chile), the Alpine-Himalayan belt, and mid-ocean ridges. But intraplate earthquakes can occur far from boundaries and are often harder to predict.
by riyaghosh971
· 9 upvotes