# Monthly Archives: February 2020

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## Making their own rivers

The students of Grade 7 made their own rivers by using mud, clay and some water. Through this activity, students learned the concept of river formation.

According to National Geographic society (source: https://www.nationalgeographic.org/encyclopedia/river/), rivers form when water falls down a mountain slope as a small stream. Rivers can have different sources, so they may be fed by water from rain or by melting snow and ice. Then, little by little, the small streams become bigger as more water flows through them.

The activity done by Grade 7 demonstrates this. By carefully pouring water from a small pail onto the mud and clay, students were able to observe how rivers naturally form.

The pictures above show Grade 7 students preparing the mud and clay by packing them together. They will, later on, pour some water onto the model. The students take note of the factors that affect the river’s shape, size, and appearance.

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## The Density Column Experiment

The Density Column Experiment is an activity that introduces the concept of Density to students of science. Density if defined, is mass per unit volume. In other words, it is the relationship between the mass of a substance and the space it takes up. In many cases, if the volume taken up is the same, the denser substance would be heavier.

In this experiment, the students are asked to stack liquids on top of each other. This is done by looking up their density and putting in the heavier liquids into the container first before the lighter ones. The denser the liquid, the more it should sink.

Students stack liquid on top of each other by first placing the heaviest liquid in the bottom of the container and carefully dripping the lighter liquid on top of it.

The students work in a group to make sure that the liquid in the bottom is not disturbed by the action of dropping the lighter liquids on top of it.

The effect is as shown in this picture. The lighter liquids, if not disturbed are able to sit on top of the heavier ones without mixing together.