Secondary 1 Hydrological Cycle

What is the hydrological cycle?

• The hydrological cycle is the movement of air currents in the atmosphere.
• The hydrological cycle is the process of soil erosion caused by water.
• The hydrological cycle is the rotation of the Earth around the Sun.
• The hydrological cycle is the continuous movement of water on, above, and below the surface of the Earth.

State the process where plants give out water vapour to the atmosphere

• Condensation
• Evaporation
• Transpiration
• Precipitation

When warm moist air cools as it rises, the water vapour will change to water droplets. Small droplets will combine to form bigger droplets and clouds. This process is know as

• Sublimation
• Evaporation
• Precipitation
• Condensation

How can the hydrological cycle lead to more groundwater?

• Evaporation causes groundwater to decrease
• Groundwater is not affected by the hydrological cycle
• Precipitation leads to the depletion of groundwater
• Precipitation infiltrates and seep into the ground during the hydrological cycle, leading to the formation of groundwater.

Surface runoff in the hydrological cycle refers to

• Evaporation of water from the soil due to exposure of its surface

• Flow of water over the land surface (e.g highlands) into bodies of water

• Water seeping into underground aquifers
• It refers to the river flow from the river source to mouth.

The global hydrological cycle is a closed system. A closed system is

• when it is self-sustaining and has no external inputs or outputs.

• No exchange of energy with the surroundings and is dependent on other process.

• Limited exchange of matter with the surroundings and its processes

• Continuous exchange of matter with the surroundings

Explain how the hydrological cycle 'moves' water through the different 'spheres' of the Earth. (from hydrosphere and biosphere to atmosphere then finally to lithosphere and hydrosphere)

Why is water a renewable natural resource?

• Water is continuously recycled through the hydrological cycle.

• Water is only found in limited quantities on Earth.
• Water is a finite resource that cannot be replenished.
• Water is created through chemical reactions.