SCIENCE 8 TOPIC 9.

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Presentation transcript:

SCIENCE 8 TOPIC 9

The three things that can happen when precipitation falls to earth

The three things that can happen when precipitation falls to earth Runs off

The three things that can happen when precipitation falls to earth Runs off Evaporate

The three things that can happen when precipitation falls to earth Runs off Evaporate Infiltrate

The definition to porosity

The definition to porosity Percentage of open space in a material

What determines porosity?

What determines porosity? NOT particle size because our lab results proved that

What determines porosity? Particle shapes – round or square

What determines porosity? Particle shapes – round or square Particle packing

What determines porosity? Particle shapes – round or square Particle packing Particle size mixing – small or large

Permeability defined

The rate that water can flow through a sample of soil Permeability defined The rate that water can flow through a sample of soil

Factors that determine permeability

Factors that determine permeability #1: The size of the pores. The larger the pores the greater the permeability

Factors that determine permeability #2: The inter-connection of the pores spaces. Greater inter-connection means a more direct pathway for the water to pass through the soil.

Permeability and pore size relationship

Permeability and pore size relationship Direct: Greater pore size means greater permeability

Three conditions under which run-off will occur

Three conditions under which run-off will occur Three conditions under which run-off will occur. The first is if the soil is saturated with water.

Three conditions under which run-off will occur Three conditions under which run-off will occur. The second is if the rate of rainfall is greater than the rate of soil infiltration.

Three conditions under which run-off will occur Three conditions under which run-off will occur. The third is if the slope is too steep for the water to infiltrate into the ground.

How does water move upward in a soil?

How does water move upward in a soil?

Two factors contribute to capillary action: the first is cohesion is where water molecules grab onto each other

Two factors contribute to capillary action: The second is adhesion is where water molecules grab onto other surfaces and try to pull themselves upward

So, can you explain how soil moves upward in a soil by capillary action?

What is the relationship between capillary action and particle size?

What is the relationship between capillary action and particle size? Indirect…the greater the particles size the less capillary action.

What is the relationship between capillary action and particle size? Indirect…the greater the particles size the less capillary action. Why?

What is the relationship between capillary action and particle size? Because the greater particle sizes do not fit very well together leaving very large pore spaces. Capillary action works best with very small pore spaces

The two types of wells Gravity well

The two types of wells ARTESIAN WELL