The study of Earth's magnetic field, including its origin, strength, variations, and interactions with solar radiation.
From geo- (Greek 'earth') + magnetism (from medieval Latin magnetismus, from magnesia). This compound term became standard in scientific English in the 19th century.
Earth's liquid iron outer core acts like a giant dynamo, spinning and churning to create a magnetic shield that protects us from deadly solar wind—without it, life as we know it wouldn't exist!
Complete word intelligence in one call. Free tier — 50 lookups/day.