Fact 1: Earth 's magnetic patterns are used for finding locations by animals that migrate.

Fact 2: Earth s rotation and iron core creates a magnetic field much like giant magnet.

Given the two facts above, answer the question "Migratory animals are dependent on what feature of the interior of the Earth for navigation?" with the following options: 
- rotating iron core
 - sense organs
 - food and shelter
 - objects that have mass
 - shield volcanoes
 - magma pipes
 - tectonic plates
 - biodiversity


 

 rotating iron core        