TOPOGRAPHY

ABOUT 70% OF THE EARTH'S SURFACE IS COVERED BY WATER.

AT FIRST CONTINENTS SEEM JUST TO BE AREAS NOT COVERED BY WATER, BUT THE DISTINCTION BETWEEN OCEANS AND CONTINENTS GOES BEYOND THAT

MOST OF THE SURFACE LIES BELOW 1 KM ABOVE SEA LEVEL AND 5 KM BELOW SEA LEVEL

 

 

THESE TWO ELEVATIONS DOMINATE THE SURFACE BECAUSE OF THE DIFFERENT ROCKS (GRANITE VERSUS BASALT) THAT MAKE UP THE CONTINENTAL AND OCEANIC CRUST.

ASIDES: COMPARABLE CURVES LOOK DIFFERENT

FOR MARS AND VENUS

MOST PEOPLE LIVE JUST ABOVE SEA LEVEL: RAISING SEA LEVEL BY 200M IF THE ICE SHEETS MELTED WOULD MAKE A BIG CHANGE