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4th grade Science

how does a glacier move? when more snow falls in winter than melts in summer.layers of snow.lower layers form ice.
what is an ice age? long periods of cold temperatures and glaciers.
what are the three soil horizon? a horizon:topsoil. b horizon:subsoil c horizon:broken-down bedrock
what ways can rock be broken down to form soil? rain wind freezing and thawing ice chemical changes
what are some of the properties soil can have? texture composition and thickness mineral content where it was formed
why is soil permeability important? high permeability:water and nutrients flow quickly. low permeability:water and nutrients flow slowly and holds water.
what is a seismograph? an instrument measures and records the energy of earthquake vibrations.
what is the focus of an earthquake? the place where movement begins.
what are earths four layers? crust mantle outer core inner core
Created by: ammybear81