S170 ch. 511 terms
Biologist A scientist who studies the behavior and characteristics of living things. Classification The grouping of organisms by their type. Kingdom One of the five main groups in biological classification. Phylum The largest of the groupings of organisms below kingdom (plural: phyla). Species Organisms that can reproduce together and have offspring that can also reproduce. Protist A tiny, one-celled organismthat is neither plant nor animal but may have characteristics of both. Alga A plant-like protist (plural: algae).
S170 ch. 414 terms
Cell The smallest, most basic unit of life. Element Matter that is made of only one kind of atom. Chemical Bond A force that holds atoms together. Molecule Two or more atoms that are joined by chemical bonds. Cytoplasm The watery substance in a cell. Cell Membrane The thin covering that holds a cell together. Nucleus The part of a cell that controls all the other parts (plural: nuclei).
S170 ch. 312 terms
Organism Any living thing or once-living thing. Biology The study of all organisms on Earth, including plants and animals. Botany The study of plant life. Zoology The study of animal life. Genetics The study of how living things pass along certain features of themselves to their offspring. Microbiology The study of organisms too small to be seen with the eye alone. Ecology The study of interactions between organisms and their environment.
S-170 ch. 214 terms
Procedure A plan that is used to complete a task. Scientific Method A step-by-step procedure that scientists use to do experiments and make new discoveries. Hypothesis A possible answer to a problem. Measurement The size or the amount of something. Unit An amount that is used by everyone when measuring a particular thing. Metric Unit A unit of measurement that is based on the number ten and multiples of ten. Meter The basic metric unit of length.
S-170 ch.114 terms
Science The study of nature and the universe. Universe All that exists, including the planets, sun, stars, and space. Galaxy A very large group of stars that travel together through space. Atom The smallest part of a substance that can still be recognized as that substance. Observation The careful study of something. Experiment A kind of test that scientists use to discover or prove something. Research To study a subject, usually using books and doing experiments.
S-170 ch. 279 terms
Astronomy The study of the stars, planets, and all of space. Milky Way The galaxy that contains the Earth and the rest of the solar system. Sunspot A dark area that forms on the surface of the sun. Satellite An object that orbits a planet. Asteroid A small, rocky object that orbits the sun. Comet A ball of ice and dust that orbits the sun. Meteoroid A piece of rock or dust in space.
S-170 ch. 2611 terms
Salinity The measure of how much salt is in something. Ocean Current A mass of water that flows like a river through an ocean. Density Current A current caused by cold, salty water, which is very dense and sinks below warmer water. Mid-Ocean Ridge A huge mountain range that runs down the middle of some oceans. Continental Shelf The gentle slope from the shore out to sea. Continental Slope The steep cliff between the continental shelf and the bottom of the ocean. Ocean Basin The bottom of the ocean floor.
S-170 ch. 257 terms
Uplifting and folding A geological process that bends layers of the Earth's crust and sometimes turns them upside down. Radioactive dating A way to find the age of rocks by measuring the decay, or breaking down, of radioactive elements in … Geological Era A huge period of time in the Earth's history. Precambrian Era The geological era that started 4.5 billion years ago and lasted nearly 4 billion years. Paleozoic Era The geological era that started 570 million years ago and lasted 346 million years. Mesozoic Era The geological era that started 225 million years ago and lasted 160 million years. Cenozoic Era The geological era of today that began 65 million years ago.
S-170 ch. 2411 terms
Weather The condition of the atmosphere at a certain time and place. Climate The average weather in a region over many years. Air mass A huge body of air that moves from place to place. Front The place where two air masses of different temperatures meet. Occluded Front The front that forms when a cold front overtakes a warm front. Meteorology The scientific study of the Earth's atmosphere and weather. Cyclone An area of low air pressure with circling winds.
atmosphere air that surrounds the Earth Troposphere layer nearest the Earth Stratosphere 2nd layer of the atmosphere ozone thin layer of gas in the stratosphere that filters out harmful radiation mesosphere 3rd layer of atmosphere ionosphere 4th layer of atmosphere ; electrically charged particles
The Earth's Crust13 terms
Earthquake a sudden, violent shaking of the Earth Geologist a scientist who studies rocks and the history of the Earth Trench Deep, long valley on the ocean floor Magma Melted rock, in the mantle, that comes through the opening of a volcano volcano Opening of the Earth's surface that releases magma from the mantle lava magma that has reached the Earth's surface Igneous rock rock formed from magma