Hydrosphere
Anything less _______ than 1.0 will float on water.
dense
In order to survive, all living things need:
shelter, air (oxygen), food, and water
_________ is the simplest part of a substance that still has all of the properties of that substance.
A molecule
What % of the earth's water that is salty/ocean
97%
What is a organisms
Any living thing
What is the universal solvent?
Water
what water does when it forms a cloud?
condensation
What is the smallest group in an ecosystem
organism
A change in matter that produces one or more new substances
Chemical Change
area that is exposed to the air at low tide and submerged at high tide
Is a intertidal zone
Describe the difference between a habitat and a community
a habitat is the background of an ecosystem- the living plants and nonliving things- no animals. A community is all the living things (plants and animals) in an ecosystem
What 4 elements make up 90% of an organisms mass?
oxygen, carbon, hydrogen, and nitrogen
What is an aquifer
a porous, water-saturated layer of sand, gravel, or bedrock through which groundwater flows.
Describe an ecosystem
Is an area of land and all the living and nonliving things that interact within it
What is it called when an element has a different number of neutrons than normal?
Isotope