McGuire Section Summary

How Did Scientists Discover that Glaciers Once Covered NYS?rocks were movedrocks in soil- not found in local bedrockWhat is A Glacier?snow adding to snow, compacting turning into ice and flow downhillice in a glacier flows- similar to solid rock in Earths mantleValley GlaciersValley Glaciers- begin in high mountain areas and flow from high ice fields through valleys to lower elevationsspread over flat lowlandsflow down to elevation where ice can meltrate ice moves varies from glacier to glacierice in small glacier moves slower than ice in large glaciergradient and volume affect speed of ice flow in glaciersContinental GlaciersContinental Glacier- flows outward from a zone of accumulation to cover a large part of a continentCentral Park and Catskills were once completely covered by iceice flowed southwardice sheets several km thick cover Greenland and Antarctica ice is less dense than water