Question

what evidence supports the existence of earths solid inner core?
seismic waves
magnetic field measurements
volcanic activity
ocean currents

Explanation:

Seismic waves are waves of energy that travel through the Earth's layers. P - waves (primary waves) can travel through solids, liquids, and gases, while S - waves (secondary waves) can only travel through solids. When seismic waves from earthquakes are studied, the behavior of these waves as they pass through the Earth's core provides evidence. The fact that S - waves do not pass through the outer core (suggesting it is liquid) but there is a change in the path of P - waves that indicates a solid inner core. Magnetic field measurements mainly relate to the movement of molten iron in the outer core generating the magnetic field. Volcanic activity gives information about the upper mantle and crust. Ocean currents are related to the movement of water in the oceans due to factors like temperature, salinity, and wind.

Answer:

Seismic waves