earth's magnetic field
nounUK /ɜːθs mæɡˈnetɪk fiːld/
US /ɝːθs mæɡˈnetɪk fiːld/
The invisible force around Earth that makes compasses point north and helps some animals find their way.
Migrating birds use Earth's magnetic field to know which way to fly.
OTHER MEANINGS
2. The magnetic bubble that protects Earth from harmful solar wind.
Earth's magnetic field shields us from charged particles from the Sun.
3. The pattern of magnetic forces that can be measured at any point on or above Earth.
Scientists map Earth's magnetic field to study how it changes over time.
4. A natural magnetic effect that causes auroras near the poles.
Earth's magnetic field guides solar particles toward the poles, creating the northern lights.