Transcript Topography and Topographic maps

Topography
• What is it?
• The Shape of the
land
• What’s in a name?
• (Greek topos,
"place", and
graphia, "writing")
is the study of
Earth's surface
features
• Topography of an area is determined
• height above sea
by:
level
• Elevation:
• difference in elevation
• Relief:
Low relief
High relief
• Landform
• a feature of
topography (the
top of the
Earth)
• Topography
shows us:
• Landforms,
elevation and
relief of each
area.
• Maps that show the
• What is a
surface features of an
topographic map?
area.
• The shape of the land.
• Topographic maps
– Elevation
provide information
about:
– Relief
– Slope
High relief
• Contour Lines:
• lines on the map that
connect points of
equal elevation
• Contour interval: • change in elevation from
one line to the
next…imagine each line
like a step up or down
PHschool topo
maps
Textbook practice
• What is the elevation of Mt. Passaconway?
• The closest Index contour line for the peaks is 3,000
feet. You can see another Index line of 2,000 feet.
There are 4 Intermediate lines between 2000 and
3000 so each intermediate line represents a 200
foot change in elevation.
• Counting up from 3,000 feet, there is 3200, 3400,
3600, 3800, and the top line is 4000
Warm-up #4
Write if each example of chemical or
mechanical weathering.
• Halite in rocks is dissolving.
• Acid from plant roots break up the rock.
• Wind blows sand around cutting at the
side of a mountain.
• Carbonic Acid dissolves limestone
creating a stalagmite in a cave
• A rock turns red due to oxidation
• A rock becomes smaller as it travels
down stream.
Warm-Up # 5
• What is a contour line?
• A line that connects points of equal
elevation.
• What are 4 major agents of erosion?
• Water, wind, ice and gravity
• What is the dominant agent of weathering
and erosion.
• Water