# Land to Water Activity by efctflxG

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```									                           Land to Water Activity
Dusti See

Time Required: 1-45 minute class period
TEKS:        Environmental science: 2C, 5B, F
TAKS:        Science 10th grade: 1.2C, 1.3B, 3.12, 4.9A

Purpose:    To be determine how much of the Earth is composed of
freshwater and is useable by land dwelling organisms like humans.

Objectives: Students will be able make predictions about land to water
comparisons on Earth.
Students will be able to use data to convert to percentages to
decimals and degrees of a circle.
Students will be able to create circle graphs with convert
numerical data.
Students will be able to analyze graphical data to make
conclusions regarding the importance of freshwater to land dwelling
organisms like ourselves.

Background Information:
Most students have some idea about the Earth’s water supply
and its importance to them. This activity is good to preface activities on
freshwater, its uses, treatment, and/or water treatment. It involves not
only science, but mathematics skills as well. Students always need to brush
up on this ability. Also, this activity allows them to make comparisons from a
global sense and then narrow it down to their local communities.

Warm Up Activities:
One suggestion for a warm up activity to get your students
thinking in this mode would be to have a blow up globe of the Earth and toss
it around the room. As each student catches the globe, have them tell
whether their thumb is on water or land. Make note of this on the board.
The class should easily see after a few trials of this that the largest
majority will land on water.
Another suggestion is to take an apple (representing the Earth)
and cut it in to quarters. Place three of the four quarters to the side
(representing water). Take the last piece and cut it into fourths. Place
three parts off to the side (represents inhospitable land). Then peel the
remaining piece of apple. This represents the amount of land that we can
inhabit. (From activity P.E.T. Apple of My Eye)

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