Also known as the Hydrologic Cycle The Water Cycle Also known as the Hydrologic Cycle

Movement and phase changes of water near Earth’s surface. The Water Cycle Movement and phase changes of water near Earth’s surface. Water Cycle Animation

1. What are the phases changes? FREEZING liquid solid gas liquid

liquid solid gas liquid 1. What are the changes of phase? FREEZING MELTING gas liquid

liquid solid gas liquid 1. What are the changes of phase? FREEZING MELTING CONDENSATION gas liquid

liquid solid gas liquid 1. What are the changes of phase? FREEZING MELTING CONDENSATION gas liquid VAPORIZATION

Properties of Water (Earth Science Reference Tables : front page) Energy gained during melting -------------334 joules/gram Energy released during freezing ---------- 334 joules/gram Energy gained during vaporization------ 2260 joules/gram Energy released during condensation--- 2260 joules/gram Density at 3.98 ° C--------------------------1.00 gram/milliliter

FREEZING CONDENSATION DURING: LIQUID SOLID LIQUID GAS 2. ENERGY IS RELEASED (lost) DURING: FREEZING Heat Released 334 J/g 2260 J/g LIQUID SOLID CONDENSATION LIQUID GAS from higher K.E. to lower K.E.

MELTING VAPORIZATION DURING: SOLID LIQUID LIQUID GAS 3. ENERGY IS ABSORBED (gained) DURING: Heat Absorbed 334 J/g 2260 J/g MELTING SOLID LIQUID VAPORIZATION LIQUID GAS from lower K.E To higher K.E.

Heating Curve of Water

temp 0C HEAT ENERGY ADDED VAPORIZATION 100 CONDENSATION WATER ICE Heating Curve of Water VAPORIZATION CONDENSATION 100 STEAM temp 0C WATER MELT FREEZE ICE HEAT ENERGY ADDED (CALORIES)

MELTING / FREEZING 00 C 00 C SEE EARTH SCIENCE REFERENCE TABLE: + 334 J/g Energy is absorbed 00 C Energy is released 00 C

VAPORIZATION/ CONDENSATION 2260 J/g 1000 C 1000 C Energy is absorbed Energy is released 1000 C

Latent heat (hidden heat) Is the potential energy that is absorbed or released when matter changes phase. There is no change in temperature (kinetic energy) when matter changes phases, but potential energy does change.

Also known as the Hydrologic Cycle The Water Cycle Also known as the Hydrologic Cycle

Precipitation Stored on land as lakes or snow Absorbed by trees or plants. Infiltrate (sink) into the ground Flow on the surface as runoff. Example: Rivers Precipitation Animation

Infiltration Rain can infiltrate (seep) into the ground Called groundwater Zone of Aeration = (above water table) pores are filled w/ air Zone of Saturation = (below water table) pores are filled with water Infiltration Animation Permeability Animation

Runoff Rain can flow over Earth’s surface Example: rivers & streams 1/3 of water returns to the water cycle Runoff Animation

Evaporation Change from liquid to gas Rate depends on: Wind speed: greater the wind speed, more evaporation Temperature: higher temperature, more evaporation Humidity: lower humidity, more evaporation Evaporation Animation Evaporation Rate Animation

Transpiration Plants release water vapor (during photosynthesis) Evaporation and transpiration is called EVAPOTRANSPIRATION. Transpiration Animation

Key Points 1water cycle song 2 Water cycle-Mr Parr A cyclic process Recycles our water Helps purify water Let’s test the classes knowledge on the water cycle! Hydrologic Cycle Quiz Animation