The hydrosphere: rivers, tides, ocean currents and waves.

1. *
The hydrosphere is the
sphere of water that
surrounds our planet. In
Latin, “hydro” means
water.

2. Hydrosphere
Oceanic
Contintental waters
waters
Underground
Oceans Seas Rivers Lakes Icebergs
water

4. Rivers: they have an
important job. They drain
the landscape, and move
water, and minerals
towards the Earth’s
oceans.

5. Seas and oceans: they move because of three phenomena:
waves, currents and tides.

6. The surface of the
Earth’s oceans are is
in constant motion,
moving up and down,
in the form of waves.

7. There are a number of
ocean currents around
the Earth. A current is These currents are caused by
like a vast river within differences in temperature,
the ocean, flowing from differences in salinity, and by
one place to another. wind.

8. But the most important factor
moving water across the ocean
are tides. Tides are caused by
the Sun and the gravity of the
Moon. Tides cause water levels
to rise and fall every six hours
approximately.