Are you thinking about Newton’s laws like F=MA and wondering if the wave is moving the earth on some scale? You might have already answered yourself because for every action there’s the equal and opposite reaction. The energy going into the sand is roughly equal in magnitude to the energy that got sent back into the sea. The waves and sand erosion you see are the manifestations of the energy bouncing around in this system as it finds homeostasis.
Are you thinking about Newton’s laws like F=MA and wondering if the wave is moving the earth on some scale? You might have already answered yourself because for every action there’s the equal and opposite reaction. The energy going into the sand is roughly equal in magnitude to the energy that got sent back into the sea. The waves and sand erosion you see are the manifestations of the energy bouncing around in this system as it finds homeostasis.
You’re thinking of momentum, not energy. Momentum finds homeostasis, energy is dissipated as heat.