click below
click below
Normal Size Small Size show me how
chapter 3 vocab
Term | Definition |
---|---|
matter | all material that has mass and occupies space |
atoms | basic units of matter |
Element | chemical substance with a given set of properties that can't be broken down into substances with other properties |
compound | substance composed of atoms of 2+ different elements |
hydrocarbons | organic compounds containing only hydrogen and carbon |
solution | mixture in which all the ingredients are evenly distributed |
macro-molecules | proteins |
proteins | polymers that serve many functions in organisms |
nucleic acids | macro-molecules that direct protein production |
carbohydrates | polymers that consist of atoms of carbon |
lipids | chemically diverse group of macro-molecules that are classified together because they do not dissolve in water |
pH | describes the acidity or alkalinity of a solution |
feedback loop | cyclical process |
negative feedback loop | output of a system moving in one direction acts as input that causes the system to move in the other direction. |
positive feedback | loop opposite of negative feedback loops |
erosion | the removal of soil by water, wind, ice, or gravity |
geosphere | made of all the rock at and below Earth's surface |
lithosphere | the hard rock on and just below Earth's surface (outermost layer of the geosphere) |
biosphere | consists of all the planet's living or once |
atmosphere | consists if the layers of gases surrounding our planet |
hydrosphere | encompasses all water |
crust | thin layer of relatively cool rock that forms Earth's outer skin both on dry land and in the ocean |
mantle | a layer of very hot but mostly solid rock |
core | located beneath the lower mantle |
Earth's outer core | is made of molten metals |
Earth's inner core | is a dense ball of solid metal |
tectonic plates | large plates of lithosphere, dragged along when the asthenosphere moves |
landforms | features such as mountains, islands, and continents, caused by the collisions and separations of plates |
deposition | the depositing of eroded soil at a new location |
evaporation | conversion of a substance from a liquid to a gas |
transpiration | release of water vapor by plants through their leaves |
precipitation | how the water returns from the atmosphere to Earth's surface, in form of rain or snow |
condensation | a change in state from a gas to a liquid |
aquifers | layers of rock and soil that hold groundwater, underground reservoirs, or storage area |
groundwater | fresh water found underground |
law of conservation | of matter principle that says matter may be transformed from one type to another, but it can't be created or destroyed |
nutrients | matter that organisms require for their life processes |
macronutrients | nutrients required in large amounts |
micronutrients | nutrients needed in small amounts |
biogeochemical cycles | nutrient cycles, in which nutrients circle endlessly throughout the environment |
primary producers | organisms that produce their own food (plants, algae) |
photosynthesis | how most producers make their own food, by using the sun's energy. Producers pull carbon dioxide out of the environment and combine it with water in the presence of sunlight. |
consumers | organisms that eat other organisms to get nutrients |
decomposers | organisms that break down waste and dead organisms (bacteria/fungi) |
cellular respiration | process by which organisms use oxygen to release the chemical energy of sugars and release CO2, and water. Opposite of photosynthesis |
eutrophication | the addition of phosphorus in bodies of water can lead to an extreme overgrowth of producers. Can also lead to extremely low levels of oxygen in a body of water |
nitrogen fixation | conversion of nitrogen gas into ammonia, only van happen by the intense energy of a lightning strike, or by nitrogen |