🔍 Key Concepts

• Difference between tide and current • How the ocean surface changes with the rise and fall of sea level • What is meant by horizontal vs vertical motion of water

💭 Think About

• Is tide mainly about water flowing from one place to another, or about the sea level going up and down? • When a tide table predicts high water and low water, what exactly is changing? • Which option describes a change you can measure against a fixed pier piling or seawall?

✅ Before You Answer

• Match the definition of tide to a change in sea level over time • Eliminate any choices that talk about water quality rather than motion • Decide whether the key motion in a tide is along the surface or up and down at a fixed point