Matching Pairs Waves, Currents & TidesOnline version 5th Grade Science Unit by Julie Copeland 1 What causes surface currents? 2 Crest 3 Wind 4 What are tides? 5 What are inlets? 6 What is a barrier island? 7 How often do tides occur? 8 Wave 9 Trough 10 Current 11 What are estuaries? The lowest part of the wave This occurs about twice a day. Water-filled spaces between barrier islands The repeated movement of water up and down Pieces of land surrounded by water on all sides that protect the mainland. The regular rise and fall of the waters in oceans and seas. Flowing streams of water that move along a curved path through the ocean in a specific direction The movement of Earth and the force and direction of wind. The highest part of a wave The cause of most waves to form The area where a river meets the ocean