geo8-24

# geo8-24 - Introduction What is geography earth describe...

This preview shows pages 1–2. Sign up to view the full content.

8/24/2011 Introduction What is geography: earth/ describe Approaches - systematic : looking at soils over the earth’s surface rather than a regional standpoint - regional : arbitrary, homogeneous character; in some cases the region has a core and there may be some influence that comes out from that - man - environment The Earth Shape : oblate spheroid -diameter 7927 miles -27 miles shorter thru poles Most of northern hemisphere is land Most of southern hemisphere is water -depths: can go about 6800ft BS (oil drilling) Crust : what we live on Density of 2.7 Mantle : layer below crust Density of 3.3 *Density is relative to the density of water Maps and grid systems Problem : trying to take a sphere and put it on a flat piece of paper Map properties -direction/azimuth (360 degree compass) -distance -area/relative to each other -shapes *Area and shape will not be shown accurately on the same map because of the earth’s three dimensional form Types of projections : how to get the globe on a flat piece of paper -Planar/plane : take a flat surface and project from the center of the globe and stretch it over the surface - Conic : cone down on top of the globe - Cylindrical : a tube over the globe, needs to be stretched either way to get the whole thing on there; Mercator maps *the most accurate areas are where the shape(cone, flat surface, cylinder) come into contact with the globe -Math/others Scale - verbal Ex. One inch=one mile - Graphic Ex. 0____1____2____3 - Fractional 1/62, 500; 1/63360 Small scale vs. large scale

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

geo8-24 - Introduction What is geography earth describe...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online