Ear to Ear

Sound is a vibration that travels through air to our ears. The ear has: Outer ear (pinna) — collects sound, like a funnel. Ear canal — channels sound inward. Eardrum — vibrates when sound hits it. Ossicles (3 tiny bones: malleus, incus, stapes) — amplify vibrations. Cochlea (snail-shaped) — converts vibrations to nerve signals. Auditory nerve — sends signals to brain, which interprets them as sound.

Animals use sounds to communicate: Warning calls (crow caws to warn of predators), Mating calls (peacock spreads tail + cries), Mother-child calls (elephant calf calls mother), Echo-location (bats emit ultrasound, hear echo to navigate and hunt). Some animals communicate without sound: bees dance to show direction to food, ants leave chemical trails, fireflies flash lights. Communication helps survival.

Natural sounds: thunder, rain, river, wind, birdsong. Artificial sounds: machines, vehicles, music. Noise pollution: too much loud noise damages hearing. Sources of noise pollution: factories, traffic, loudspeakers, firecrackers. Effects: hearing loss, stress, difficulty sleeping, affects wildlife (whale communication disrupted by ship engines). Solution: soundproof walls, quiet zones, noise regulations.