Definition: A substance (of molecular formula H₂O) found at room temperature and pressure as a clear liquid; it is present naturally as rain, and found in rivers, lakes and seas; its solid form is ice and its gaseous form is steam.

Alright class, settle down now, let’s take a look! Today we're tackling ‘waters,’ a word quite grand, Let’s break it down with understanding at hand. The dictionary tells us, clear and true, “H₂O” is what it’s made of, for me and you! (That’s two hydrogen atoms, a simple plea, And one oxygen atom, for all to see!) It's liquid at room temperature, nice and bright, A clear, flowing substance, a beautiful sight. You find it falling down as gentle rain, Or rushing in rivers, again and again! In lakes so still, and seas so deep, Secrets within its currents sleep. And when it's cold, it freezes fast, Turning to ice, built to last. But heat it up, let it steam with glee, Becoming vapor, wild and free! So ‘waters’ is simply water, you see, Essential for life, wonderfully! Any questions? Don’t be shy, let's discuss, Understanding science, a joyful plus!

Definition: The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest.

Alright class, settle down now, let’s take a look and see, At the word "watershed," it’s important for you to decree! The dictionary gives us a clue, precise and neat, "Topographical boundary," a landscape we must meet. Think of it like this, my dears, a hill or mountain high, A ridge you might call it, reaching toward the sky! It’s where rivers change their course, a pivotal bend, Dividing streams that flow, until the very end. Like catching raindrops, one basin then another, The watershed's the line – a crucial border! So a catchment basin is the land that gathers rain, And this ridge or crest determines where it will remain. It’s a dividing point, a significant place, A watershed , remember with effortless grace! Do you have any questions? Let's discuss and explore, Understanding watersheds – wanting to learn more!