Continental waters rivers and groundwater

3. CONTINENTAL WATER: RIVERS AND GROUNDWATER RIVERS - Are continously flowing currens that flows into seas, lakes and other river.

If a river flows into another river, it’s called tributary.

3 stages in the course of a river: - 1. UPPER COURSE: - river leaves its source - It flows rapidly through steep mountainous areas -It erodes rocks - - it creates river valleys - 2. MIDDLE COURSE: - River flows less rapidly - It transports sand and stones - it creates bends called meanders - 3. LOWER COURSE: - River flows slowly - It deposits sediments - It reaches the river mouth

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The flow is the volume of a water river and it depends on: - 1. the amount of rainfall: whiich can change duing the year.

- 2. The type of soil: - permeable soil: part of the water filters into the ground - impermeable soil: water of the river doesn’t filter.

3. CONTINENTAL WATER: RIVERS AND GROUNDWATER GROUNDWATER -

Rainwater infiltrates rocks and soil and can be found as GROUNDWATER under the Earth’s surface.

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Groundwater makes up about 20% of the Earth’s fresh water.

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AQUIFERS: are stores of groundwater that accumulate underground on top of impermeable layers.

- We can use wells to take out this water o the surface.

- We can use it for agriculture.