Unequal Heating of the Earth - PowerPoint PPT Presentation

1 / 27
About This Presentation
Title:

Unequal Heating of the Earth

Description:

This affects land/sea breezes Both sea and land breezes are caused by unequal heating of Earth ... GLOBAL WIND BELTS Global winds are named based off of where they ... – PowerPoint PPT presentation

Number of Views:1535
Avg rating:3.0/5.0
Slides: 28
Provided by: vdbw7
Category:

less

Transcript and Presenter's Notes

Title: Unequal Heating of the Earth


1
  • Unequal Heating of the Earth

2
Heating the Earth
  • The sun heats air, land water BUT air, water,
    and land get heated differently.
  • The sun heats all areas of the Earth BUT
    different areas of the world get heated
    differently

3
The Sun
  • The most important source of energy for the Earth

4
So whose getting the most Sun?
  • Areas around the equator get more sun than areas
    near the North and South Pole
  • Small degrees of latitude (0 30 degrees) get
    more sun

5
3 ways that heat can be transferred
  • The sun can heat things in 3 different ways.

6
Conduction
  • Happens when two objects of different
    temperatures are touching each other
  • Heat travels from the warmer object to the cooler
    object
  • Examples touching a stove and being burned, ice
    cooling down in your hand

7
Radiation
  • Happens when the heat energy from one object is
    transferred directly to another (not through
    contact, or through a liquid or a gas)
  • Examples warmth of the Sun, a campfire, or an
    open oven door, heat from a light bulb

8
Convection
  • Happens when warmer areas of a liquid or gas rise
    to cooler areas in the liquid or gas and then
    come back down when they get colder.
  • Creates a circle, because of density differences
  • Example convection currents, water boiling in
    circles in a pot, old heaters

9
Inquiry Heat Lab
  • Research question If we measure the temperature
    of soil/sand and water when it is heated by
    radiation, which one will absorb and lose heat
    fastest?
  • Background Research
  • Earth materials the naturally occurring
    materials found on Earth (water, air, soil,
    sand).
  • Lab Safety DO NOT TOUCH THE HEAT LAMP!

10
Lab Description
  • We will place different materials in small cups,
    place a thermometer in them, and use heat lamps
    to represent the suns radiation.
  • We will record the temperature every 2 minutes
    for 20 minutes. After 10 minutes we will turn off
    the heat lamps.
  • Group members will rotate measuring the
    temperature of each material.
  • You will record the temperature on your own data
    collection sheet and share your data with your
    team between the 2 minute intervals.

11
Lab Expectations
  • We will work in groups of 4-7.
  • We will measure temperatures silently and raise
    our hands with any questions.
  • We will stay focused only on the lab.
  • After data collectedyou will find your number
    match and work together to fill in your other
    table, to graph and to answer post lab sheet.

LAB SAFETY DO NOT TOUCH THE HEAT LAMP!
12
Post lab What do you think?!
  • What energy source heats things up during the
    day?
  • Do you think the surface of Earth affects how hot
    the air gets?

13
Heat Capacity
  • The amount of heat required to change the
    temperature of the matter.
  • Which means How much heat does the object need
    to absorb in order to actually warm upthe LONGER
    the object takes to change temperature the
    GREATER THE HEAT CAPACITY.
  • Critical Thinking Which had the greater heat
    capacitysand or water? THINK PAIR SHARE

14
Application/ Check for understanding
  • Which heats up fastertoast or coffee?
  • Which stays hot longertoast or coffee?

15
Differential (unequal) heating of land vs. water?
  • Land heats up faster than water and cools down
    faster than water
  • The air above land is much warmer than the air
    above waterland transfers heat to air faster and
    more frequently (conduction)

16
Differential (unequal) heating of land vs. water?
  • Water heats up more slowly and cools down more
    slowly
  • It has a greater heat capacity

17
Wind
  • Wind is the horizontal movement of air from an
    area of high pressure to an area of lower
    pressure.
  • Wind is caused from the unequal heating of the
    earth
  • What causes areas of the earth to be heated more
    or less?
  • Suns Energy!

18
Which type of heat transfer causes wind?
  • Radiation Suns radiation will hit earth at
    different angles (directly/90 degrees or
    indirectly/30 degrees)
  • Convection Warm air rises, cold air sinks this
    causes the air to move
  • Conduction Land loses and gains heat quickly,
    water loses and gains heat slowly. This affects
    land/sea breezes

19
Local winds are winds that travel over short
distances.
  • Both sea and land breezes are caused by unequal
    heating of Earths surface.

20
(No Transcript)
21
In Summary
22
Group Work Challenge from Homework
23
Global Wind Belts (Part 2)
24
GLOBAL WINDS
  • Global winds are created by the unequal heating
    of Earths surface.

25
GLOBAL WIND BELTS
Global winds are named based off of where they
COME FROM!
26
GLOBAL WINDS
  • Global winds are an example of CONVECTION because
    heat is circulated around the globe by the
    movement of a fluid (AIR!).

27
CORIOLIS EFFECT
Write a Comment
User Comments (0)
About PowerShow.com