Choose the mean salt content of sea water.

Choose what proportion of the surface of the Earth is covered by water.

Choose the smallest ocean.

Choose the Mediterranean Sea.

Choose the inland sea.

Choose two factors that create tidal movement of seawater.

Where is the difference in tidal movement larger: on inland seas or on peripherical seas?

Choose what causes waves.

How many times do you have low tide at one coastal location in one day?

What do you call the high tide at the conjunction of Moon and Sun?

Choose the global wind that drags oceanic currents in the hot zone.

Choose the temperature of the oceanic current that moves from lower to higher latitudes.

Choose the oceanic current that drifted the iceberg which sunk Titanic.

Name the local difference in temperature that is created by oceanic currents.

Choose two terms for this definition: Water above the first impermeable layer.

Choose the term for this definition: Water between two impermeable layers.

Choose the term for this definition: Water in the cracks and fissures of limestone.

Choose the term for this definition: Water containing a high proportion of mineral salts.

Choose the term for this definition: Water on the first impermeable layer.

Choose the term for this number in the picture: 2

Choose the term for this number in the picture: 3

Choose two terms for this number in the picture: 5

Choose the term for this number in the picture: 8

Choose the term for this number in the picture: 9

Choose a term for this defintion: The amount of water in m3 flowing through the crossection of a river in a second.

Choose a term for this defintion: The boundary that marks the area drained by a river.

Choose a term for this defintion: A type of estuary where the river deposits material and separates into narrow channels at the sea.

Choose a term for this defintion: The way how the water level of a river changes through a year.

Choose a term for this defintion: Side river of a main river.

Choose the picture of a meander.

Choose two pictures for a middle course river.

Choose one pictures for a rapid

Choose the picture for a canyon.

Choose the picture for a gorge.

Choose the picture for an island.

Choose the picture for the pair of a river cliff and and a slip-off slope.

Choose two pictures for estuary (a delta and a funnel shaped).

This lake forms as plate movements shrink oceans.

This lake forms when a glacier pushes frontal rock debris into a dam.

This type of a lake formed in the ice age on plains in North America and Europe.

This type of a lake formed in summit regions of mountains in circular, ice collecting basins.

This type of a lake formed out of a meander.

This type of a lake formed by karstic process on limestone surface.

This type of a lake formed in a graben that sunk as plates moved.

This is Lake Szelidi.

This is Lake Saint Anna (Sfanta Ana).

This is Lake Garda.

This is Lake Balaton.

This is a moraine lake.

This is a trench lake.

This is an ox-bow lake.

This is a volcanic crater lake.

This is Lake Michigan.

This is Lake Lupa.

This is Lake Tanganyika.

This is Lake Tisza.

These two lakes are artificial lakes.

This is an other trench lake.

The basin of this lake was carved out by an icesheet in the ice age.