. What were the observations that Mohorovičić made that led to his discovery of the Mohorovičić Seismic Discontinuity?(1 point)

Question

Responses

earthquake waves travel into the ocean
earthquake waves travel into the ocean

all earthquake waves travel at the same speed
all earthquake waves travel at the same speed

earthquake waves were refracted at a certain depth under the surface of the earth

Answer 1

The correct observation that led to Mohorovičić's discovery of the Mohorovičić Seismic Discontinuity is:

earthquake waves were refracted at a certain depth under the surface of the earth.

This observation indicated a change in the materials and properties of the Earth's interior, marking the boundary between the Earth's crust and the underlying mantle.