Ask a group of students to form a line, which represents a river. Give them a ball. The students have to pass the ball to each other. The children at the start of the line represent the upper part of …
Explain to students that they will talk about water’s ability to clean itself: What is the self-purification capacity of a river? (River’s ability to clean itself) How can water in a river clean itself? (There are various natural processes related …
Explain the importance of permeable surfaces in slowing down the water from precipitation or runoff, thus providing more time for decomposition of waste to occur. Prepare the experiment: Fill the first flowerpot with soil, the second with gravel, the third …
Explain the importance of vegetation cover in water retention, filtering precipitated or runoff water, and in preventing soil erosion. Prepare the experiment: Cut one side of the large bottles. In the first bottle, put soil seeded with plants and wait …
Begin with a brainstorming session on how the natural purification of water works. Remind students of various self-purification processes in rivers and nature. Put the sponge on the top of the empty clear glass. Make a small alcove and pour …
Draw a watershed of your local stream or small river: Choose a stream together with students and locate it on a local map. The stream should be small. Cover the map with tracing paper and draw the stream with all …
Have a discussion about all possible surface waters in your neighborhood: Do you know from where streams, rivers, lakes, ponds, lagoon in your town get their water? How large is the watershed of your river? Making the map of watershed: …
Materials: no material needed; Different parts of a body are associated with specific terms: river watershed = the whole body, spring = head, river = belly, sea = knee; The children should listen to the words of the teacher and …
Sterlet – Acipenser ruthenus (Hegediš, 2007) DINOSAUR FISH: Sturgeon fish species of the Danube River Mirjana Lenhardt, Marija Smederevac-Lalić Key words: sturgeon, biology, importance Sturgeons are very old group of fish species dating back more than 250 million years ago. …