earth and space Flashcards
earth is compost of thee parts
soil,water and air
types of soil
sandy, loam, clay
fertile soil with decaying mattet
loam
soil in which particles are coarse and loose
sands
particles are packed together tightly, it is sticky when wet and has the finest textur
clay
compost of organism materials from decaying plants and animals
humus
layers of soils
top soil, sub soil,parent rock,bedroick
the uppermost layer of the soil, this layer is rich in organic materials called humus
top soil
located just below the top soil it compost of loosely arranged rocks,sand, and clay this late is rich in minerals that drain from too soil
sub soil
compost of rocks that are slowly breaking apart it does not contain necessary nutrients and water for plants to grow
parent rock
lowest if the soil layer it is mad up of undisturbed large boulders and gravel
bedrock
refers to the things materials or conditions that remain constant o the same
controlled variables
refers to the things materials or conditions that are varied or changed
manipulated variables
refers to the things materials or conditions that respond to the changes
responding variables
kinds of water
fresh water and salt water