Weather and Climate

1
Weather and Climate

• Part 1
• Day 1
• Exciting slide huh?

2
Weather and Climate

• Weather
• The condition of the atmosphere, or the air that
  surrounds the Earth, at a certain place and time.
• Weather _at_ BrainPop

3
Weather and Climate

• Atmosphere
• The air that surrounds the Earth.
• Atmosphere _at_ BrainPop

4
Weather and Climate

• Troposphere
• The layer closest to the Earth.

5
The Layersof the Atmosphere
6
Weather and Climate

• Temperature
• The measure of how hot or cold something is.
• Temperature _at_ BrainPop

7
Weather and Climate

• Humidity
• A measure of how much moisture is in the air.
• Water Vapor
• Water in the form of a gas.
• Humidity _at_ BrainPop

8
Weather and Climate

• Q How does the air feel on a hot humid day? Why?
• A On a hot, humid day, the air feels damp and
  sticky because it contains so much moisture.

9
Bonus Definitions

• Absolute Humidity
• How much water is actually in the air.
• Relative Humidity
• The relative humidity tells how much water the
  air is holding compared to how much it could hold
  at a certain temperature.

10
Weather and Climate

• Air Pressure
• The weight of the air around Earth pressing down
  on Earth's surface.
• How Does Air Pressure Cause Ear Popping?
• The main cause of air pressure-related ear
  popping is an imbalance between the pressure
  within the ear and the pressure outside of the
  ear. Anytime there is a huge disparity between
  the two air pressures, the tympanic membrane, or
  eardrum, expands or contracts in an effort to
  help equalize the pressures. This contraction or
  expansion causes a popping or crackling sound in
  the ears.
• From ehow.com

11
Weather and Climate

• Q Does cold or warm air have more air pressure?
  Why?
• A Cold air tends to have higher air pressure
  than warm air because it weighs more.
• Have you ever heard that Warm Air rises?

12
Weather and Climate

• Local Wind
• Affects weather in only a small region.

13
Weather and Climate

• Sea Breeze
• Warmer air over the land is pushed up by cooler
  air moving in from over the water.
• Land Breeze
• Warmer air over the water is pushed up by cooler
  air moving out from over the land.
• Wind _at_ BrainPop

14
Weather and Climate

• Prevailing Winds
• A pattern of moving air over large parts of
  Earth.
• Bonus
• Prevailing Winds (global winds) are caused by the
  uneven heating of large areas of Earth's surface
  caused by Earth's rotation, or spin.
• Prevailing Winds blow from the same general
  direction.
• In the United States winds called the Prevailing
  Westerlies blow from west to east.

15
Weather and Climate

• A Sea breeze
• B Land breeze