77 terms

7th Grade Science

Vocabulary set based on Washington State Standards and Performance Expectations.
STUDY
PLAY
Booger
To examine carefully and in detail so as to identify causes, key factors and possible results.
Atmosphere
The layer of gases that may surround the Earth and other material bodies of sufficient mass.
Biodiversity
The diversity among and within plant and animal species in an environment.
Catastrophe
A sudden and widespread disaster as a result of a violent disturbance.
Characteristic
A distinguishable trait, quality, or property.
Condensation
The process of changing a gas or vapor to a liquid.
Conduction
The transfer of heat energy through matter by the movement of molecules.
Consumer
An organism that gets its chemical energy for growth and development from other organisms. Animals in a food web are consumers that obtain food energy by eating other animals or plants.
Control
A standard condition that other conditions can be compared to in a scientific experiment.
Controlled variables
The conditions that are kept the same from trial to trial in a laboratory investigation.
Convection
The transfer of heat energy by the physical movement of matter. Occurs in liquids and gases.
Core of the Earth
Most likely a solid sphere about 1,220 km in radius. It is believed to consist of an iron-nickel alloy.
Crust
The Earth's outermost shell that is composed of a variety of igneous, metamorphic, and sedimentary rocks. Earth's crust includes the oceanic crust, about 7-10 km thick, and the continental crust, about 35-40 km thick.
Crustal plates
Pieces of the Earth's crust that float on the asthenoshere and move in relation to one another.
Cycle
Any complete round or series of occurrences that repeats or is repeated.
Decomposers
Organisms that consume the remains of dead organisms and break down the tissues into simpler forms of matter that can be used as nutrients for other living organisms.
Density
Defined as mass per unit volume.
Deposition of sediments
The geologic process following erosion, in which particles of sand or soil are no longer transported from their source by wind or water and are added to a new landform.
Diagram
A chart, plan or drawing that outlines and explains the parts or operation of something.
Diversity
A wide variety. Species diversity refers to the abundance of different species within an ecosystem.
Draw
To deduce or infer.
Earthquake
A series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating.
Ecosystem
A natural unit consisting of all plants, animals, and microorganisms in an area functioning together with all of the nonliving physical factors of the environment.
Erosion
When solids (sediment, soil, rock and other particles) are carried away or displaced usually by wind, water, or ice by down-slope movement in response to gravity or by living organisms.
Estimate
To form an approximate judgment or opinion regarding the worth, amount, size, weight, etc., of; calculate approximately.
Evaluate
To make judgments based on collected data.
Evaporation
Change in state of a substance from liquid to gas.
Evidence
Tends to prove or disprove something by making observations and measurements, or collecting data through scientific processes.
Experiment
A test, trial, or tentative procedure with the purpose of discovering something unknown.
Factor
The Agent or condition that could cause a change.
Fault
A geological rock fracture that shows evidence of relative Earth movement that may extend hundreds or even thousands of kilometers.
Field studies
The scientific study of free-living plants or animals in which the subjects are observed in their natural habitat without changing, harming, or materially altering the setting or subjects of the investigation.
Food web
The complex eating relationships among species within an ecosystem. Organisms are connected to the organisms they consume by arrows representing the direction of energy transfer.
Formation
The act or process in which a thing is formed or arranged.
Fossils
The preserved remains or traces of animals, plants, and other organisms from the remote past.
Gas
A state of matter consisting of a collection of particles without a definite shape or volume that are in more or less random motion.
Habitat
An ecological or environmental area that is inhabited by a particular species. It is the natural environment in which an organism lives or the physical environment that surrounds (influences and is used by) a species population.
Heat Transfer
The process in which heat moves from one body or substance to another by radiation, conduction, convection, or a combination of these methods.
Hydrologic Cycle
The natural sequence through which water passes into the atmosphere as water vapor, precipitates to earth in liquid or solid form, and ultimately returns to the atmosphere through evaporation.
Hydrosphere
The water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere.
Igneous rock
Formed when molten magma cools.
Interpret
To present an explanation of an event or process.
Investigate
To plan and conduct an organized scientific study to answer a question.
Investigation
A method of planning or conducting a scientific study to answer a question or problem
Landform
A specific geomorphic feature on the surface of the earth, ranging from large-scale features such as plains, plateaus, and mountains to minor features such as hills, valleys, and alluvial fans.
Lithosphere
The solid portion that is made up of the crust and upper mantle of the earth.
Manipulated (independent) variable
The factor of a system being investigated that is changed to determine that factor's relationship to the dependent (responding) variable.
Mantle
A thick, putty-like layer between the crust and the outer core that is about 2,900 km thick and makes up about 70% of Earth's volume.
Metamorphic rock
Rocks modified by temperatures and pressures that are high enough to change the original minerals into other mineral types or into other forms of the same minerals.
Mixture
A substance made by combining two or more different materials without a chemical reaction occurring because the objects do not bond together.
Models
A simplified representation of a system and are useful for studying systems that are too big, too small, or too dangerous to study directly.
Niche
The position of a species or population in its ecosystem. A shorthand definition of niche is how and where an organism makes a living.
Phenomena
A fact, occurrence, or circumstance observed or observable Phenomena.
Photosynthesis
A metabolic pathway that converts light energy into chemical energy. Its initial substrates are carbon dioxide and water; the energy source is sunlight (electromagnetic radiation); and the end products are oxygen and (energy-containing) carbohydrates, such as sucrose, glucose, or starch.
Plate Tectonics
The theory that lithospheric plates move slowly over the underlying mantle.
Population
The collection organisms of a particular species that can breed and reproduce.
Precipitation
A form of water, such as rain, snow, or sleet, that condenses from the atmosphere, becomes too heavy to remain suspended, and falls to the Earth's surface.
Pressure
The exertion of force upon a surface by an object, fluid, etc.
Procedure
An organized series of steps to conduct a scientific investigation.
Radiation
Energy in the form of rapidly propagating waves or particles emitted by a body as it changes from a higher energy state to a lower energy state.
Relationship
Connections observed among systems, subsystems, or variables.
Responding (dependent) variable
The factor of a system being investigated that changes in response to the manipulated (independent) variable and is measured.
Rock Cycle
A model that describes how rocks slowly change from one form to another through time.
Sample
To take a sample of, especially to test or examine by a sample.
Sediment
Any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid.
Sedimentary rock
Rocks formed by deposition of solid particles at the bottom of a body of water, followed by compaction and cementation. Common sedimentary rocks include shale, sandstone, and limestone.
Solvent
Is a substance, usually a liquid, capable of dissolving another substance.
Species
A group of organisms capable of interbreeding and producing fertile offspring.
Survey
Examine and record the area and features of an area of land so as to construct a map, plan, or description.
Thermal
Pertaining to heat.
Transform
Change from one form to another.
Tsunami
Unusually large waves created when a body of water, such as an ocean, is rapidly displaced by an earthquake, volcanic eruption, landslide, or other disruption (plural: tsunami).
Water cycle
Continuous cycle of water molecules on Earth as they rise into the atmosphere, fall back to Earth as rain or other precipitation, and flow into rivers or oceans.
Water vapor
The gas phase of water.
Weathering
The decomposition of earth rocks, soils and their minerals through direct contact with the planet's atmosphere or biological agents.
Wind
The flow of air or other gases that compose an atmosphere.
Climate
Includes the temperatures, humidity, atmospheric pressure, winds, rainfall, atmospheric particle count, and numerous other meteorological elements in a given region over long periods of time.