Wha are Tides?
the periodic changes in the level of the water in the oceans and seas caused by the gravitational pull of the Sun and the Moon.
What causes serious floods??
summer or autumn storms, or when heavy rain falls in the mountains, or there is a rapid melting of snow.extreme weather phenomena
Saltwater makes up what percentage of water on Earth?
97%
What is transpiration?
the conversion of water from liquid to gas as it passes through plant
What are the 3 courses of a river and how are they different ?
upper, middle and lower. location, water flow, speed, erosion
Where is The largest glacier?
Antarctica
what is precipitation?
condensation of atmospheric water vapor that falls under gravitational pull from clouds
Where is fresh water found?
under the ground (groundwater) and on the surface (glaciers, lakes and rivers).
What affects the flow of a river?
mountains and relief, climate,
Where do interception and infiltration happen?
....
what are the two main Risks and Problems related to water
Water scarcity and extreme excess of water (floods)
What does heat turn water into
vapour
The river _______________ increases during rainy seasons and decreases during dry seasons.
flow rate
what is more dense cold or hot water?
cold
What sources drive the ocean currents?
wind, tides, changes in water density, rotation of the earth