What was Mohorovičić's observation?(1 point)
Responses
Seismic waves travelled at constant speeds.
Seismic waves travelled at constant speeds.
Seismic waves travelled at varying speeds.
Seismic waves travelled at varying speeds.
Seismic waves penetrated all Earth's layers.
Seismic waves penetrated all Earth's layers.
Seismic waves could not go through the brittle crust.