Chapter 2 - Earth's Physical Systems Flashcards
Natural capital
Earths accumulating wealth of resources.
Environment
The sum total of our surroundings, including all of living things and non-living things with witch we interact.
enviromentalsim
a social movement dedicated to protecting the natural world, and by extension, people.
science
(1) a systematic process for learning about the world and testing our understanding of it. (2) the accumulating body of knowledge that arises from dynamic process.
descriptive science/observable science
research in which scientists gather basic information about organisms, materials, systems, or processes that are not yet well known.
hypothesis driven science
research in which scientists prose questions that seek to explain how and why things are the way they are. generally proceeds in a somewhat structural manner, using experiments to test the hypothesis.
scientific method
a formalized method for testing ideas and observations that involves series of interrelated steps.
experiment
an activity designed to test the validity of a hypothesis by manipulating certain variables.
variable
in an experiment, a condition that can change.
independent variable
the variable that scientists manipulate in an experiment.
dependent variable
the variable that is affected by manipulation of the independent variable in an experiment.
controlled experiment
an experiment in which a treatment is compared against a control in order to test the effect of the variable.
control
the portion of an experiment in which a variable has been left un-manipulated, to serve as a point of comparison with the treatment.
treatment
the portion of an experiment in which a variable has been changed/manipulated in order to test its effects.
data
information, generally quantitive information.
manipulative experiment
an experiment in which the researchers actively choose and manipulate the independent variable.
natural experiment
an experiment in which the researchers cannot directly manipulate the variables and therefore must observe nature, comparing conditions in which variables differ, and interpret the results.
peer review
the process by which a manuscript submitted for publication in an academic journal is examined by specialists in the field, who provide criticism (generally anonymously) and judge wether the work merits publication in the journal.
theory
a widely accepted, well tested explanation of one or more cause-and-effect relationships that has been extensively validated by a great amount of research.
paradigm
a dominant philosophical and theoretical framework within a scientific discipline.
wicked problems
problems complex enough to have no simple solution, and whose very nature changes over time.
predictions
specific statements that can be directly and unequivocally tested.
tsunami
an immerse swell, or wave of ocean water triggered by an earthquake, volcano, or landslide that can travel long distances across oceans and intricate coasts
matter
all material in the universe that has mass and occupies space
chemistry
the study of the different types of matter and how they interact
law of conservation of matter
the physical law stating that matter may be transformed from one type of substance to others, but cannot be created or destroyed
uranium
the chemical element with 92 protons and 92 neutrons. uranium is used as a fuel source to produce energy with nuclear power
element
a fundamental type of matter; a chemical substance with a given set of properties, which cannot be broken down into substances with different properties. chemists currently recognize 92 elements that occur in nature, as well as 20+ others that have been artificially made.
hydrogen
the chemical element with one proton. the most abundant element in the universe.also a posibble fuel for our possible economy
oxygen
the chemical element with 8 protons and 8 neutrons. a key element in the atmosphere that is produced through photosynthesis
silicoln
the chemical element with 14 protons and 14 neutrons. an abundant element in rocks in earths crust
nitrogen
the chemical element with 7 protons and 7 neutrons. the most abundant element in the atmosphere, a key element in macromolecules, and a crucial plant nutrient
carbon
the chemical element with 6 protons and 6 neutrons. a key element in organic compounds
atoms
the smallest component of an element that maintains the chemical properties of that element.
proton
a positively charged particle in the nucleus of an atom.
neutron
an electrically neutral (uncharged) particle in the nucleus of an atom
electron
a negatively charged particle that moves around the nucleus of an atom
isotopes
one of several forms of an element having different number of neutrons in the nucleus of its atoms. chemically, isotopes of the same element behave almost identically,but they have different physical properties because they differ in mass
radioactive
the quantity by which some isotopes “decay” changing their chemical identity as they shed atomic particles and emit high-energy radiation
half-life
the amount of time it takes for one-half the atoms of a radioisotope to emit radiation and decay. different radioisotopes have different half-lives, ranging fractions of a second to billions of years