solidifies at a mid-ocean ridge, as older, existing sea floor moves away from the ridge. cytology - study of cells. characteristic - property, feature, quality or trait that describes an object. theory of plate tectonics - idea that combines the ideas of continental drift and ocean-floor spreading to explain the           formation of plant species can grow there. saprophyte - organism that feeds on dead things. germ - microorganism, especially one that causes disease. thermosphere - uppermost layer of the atmosphere, in which temperature increases as altitude increases. inner core - solid, innermost layer of the Earth. molting - process of an arthropod shedding its exoskeleton to allow for growth. grassland soil - very rich, fertile soil that is excellent for growing crops. nuclear fission - splitting of an atomic nucleus into two smaller nuclei during which vast amounts of energy is released.  rate of reaction - speed at which reactants are consumed and products are produced in a given reaction.  water pollution - waste matter or other material that is introduced into water and that is harmful to organisms that live in, drink, or luster - way a mineral reflects light. protozoan (plural-protozoa) - unicellular animal-like protists. urbanization - growth of urban areas caused by people moving into cities. acid rain - rain that has become more acidic than normal due to pollution. pollination - transfer of pollen to an egg-producing organ. talus slope - pile or rock fragments at the base of a mountain or on a mountain slope. incubation period - time between contact with a source of infection and the outbreak of symptoms.                 making proteins for the cell. longshore drift -  zigzag movement of sand along a beach, caused by the action of waves. particle - very small piece of matter such as an atom, molecule, or ion. strong magnetic field. electromagnet - magnet consisting of a coil of wire wrapped around a core that becomes strongly magnetized when            current flows nebula - massive cloud of dust and gas in which stars are probably born. oral groove - mouth-like indentation in a paramecium and other unicellular organisms. taxonomy - science of classification. gem - rare, very valuable and beautiful mineral. air pollution - contamination of the atmosphere by the introduction of pollutants from human and natural sources. characterized by periodic variations of electric and magnetic fields.  particulate - tiny particle or droplet, such as dust, dirt, or pollen that are mixed in with air.                                           mechanical wave - wave that can travel only through matter; can be either a transverse or a compressional wave. eclipse - total or partial blocking out of the sun or moon by a shadow. temperate zone - climate zone in each hemisphere that extends from about 30o to 60o latitude. fertilization - joining of egg and sperm to make a new cell. metazoan - multicellular animals that cause scabies and pubic lice. soil horizon - soil layer with physical and chemical properties that differ from those of soil layers above or below it. neap tide - high tide lower than usual during first and third quarter moons; a twice-monthly tide of minimal range that occurs telescope - instrument that collects electromagnetic radiation from the sky and concentrates it for better observation. bacterium (plural-bacteria) - unicellular, heterotrophic microorganism containing no nuclear membrane. warming of the surface and lower atmosphere of Earth that occurs when water vapor, carbon dioxide, and other gases investigation.                                                                                                                                                                         23 tectonics - branch of Earth science that deals with the movements that shape the Earth’s crust. function - special, normal, or proper activity of an organ or part. wedge - moving inclined plane with one or two sloping sides; a type of simple machine that consists of an inclined plane used to recycling - process of recovering valuable or useful materials from waste or scrap. cinder - small volcanic bomb about the size of a golf ball. Oort cloud - spherical region that surrounds the solar system, that extends from the Kuiper Belt to almost halfway to the nearest tidal range - difference in levels of ocean water at high tide and low tide. vertebra (plural-vertebrae) - bone in the vertebral column. ion - atom that loses or gains electrons; charged atom.                                                                                                                          value - that which is desirable or worthy of esteem for its own sake. creep - slow downhill movement of weathered rock material. single-parent family - single mother or father and their children. scatter plot graph - tool that displays data from two related sets as ordered pairs; shows a set of similar things. antibiotic - substance produced by helpful bacteria that destroys or weakens disease-causing bacteria. flammability - ability to burn. life zone - narrow region of space around a star in which a planet that contains life can exist. stoma (pl-stomata) - tiny opening in plant leaves through which water vapor, oxygen and carbon dioxide pass. spore - single reproductive cell that can grow into a multicellular organism. continuously changes locations and/or forms. catalyst - substance that speeds up or slows down chemical reactions, but is not itself changed by the reaction; a substance that division - in the taxonomy of plants, the group smaller than a kingdom but larger than a class. multicellular - having many cells. sedimentary rock - type of rock formed in layers of sediment that are compressed and cemented.  genotype - sum total of the genetic information contained in an organism.  Doppler effect - apparent change in the wavelengths of light that occurs when an object is moving toward or away from the Earth. from the center of the core to the surface of the crust. absorption (absorb) - process of taking in; soaking up; or making a part of something. plasma - phase in which matter is very high in energy and cannot be contained by the walls of ordinary matter, very           rare on Earth; Hold your mouse over the name of a skill to view a sample question. chlorophyll - green substance needed for photosynthesis. Vocabulary Unit for SPACE EXPLORATION 2 of 26th Grade Science Visual Vocabulary / Word Wall/ Vocabulary Cards. foster family - child care provided in a family setting by non-biological parents. mollusk - invertebrate animal with a soft body, muscular foot, and a mantle. center of a cylinder that is allowed to rotate freely, yielding a mechanical advantage equal to the cylinder’s diameter.  horizon - line where the sky and the Earth appear to meet. reproduce only among themselves and usually geographically distinct. power. rille - valley on the moon. Glossopteris - extinct seed fern that grew about 250 million years ago. ionosphere - layer of electrically charged particles in the thermosphere. thermal conduction - transfer of energy as heat through a material. unfoliated rock - texture of some metamorphic rocks in which crystals are not arranged in bands and do not break in layers. shear stress - stress that occurs when forces act in parallel but opposite directions, pushing parts of a solid in opposite directions. continental climate - climate that occurs in the interior of a continent, with large temperature differences between seasons. seismology - study of earthquakes. hanging wall - block of rock above a fault. tissue - group of cells similar in structure and joined together to perform a common function; four basic types of tissue are muscle, energy efficiency - measurement of useable energy after an energy conversion; the ratio of useable energy to the total energy after unicellular - having one cell. transfusion - process of transferring blood from one body to another. This is the right place where find the answers to your questions like : Who ? amphibians, involves hiding in cooler, more humid ground. lava - hot, molten rock that has reached the Earth’s surface. This is because the definitions are straightforward and provide an essential foundation upon which students can understand the connectivity of the words. ingestion - eating.                                                                                                                                                                                           11 extended family - parents, children, and other relatives such as grandparents, aunts, uncles, and so forth.                 species that formed the fossil existed for only a short span of geologic time. muck fire - fire that burns organic material in the soil. plateau - broad, flat area of land that rises more than 600 meters above sea level. surface current - horizontal movement of ocean water that is caused by wind and that occurs at or near the ocean’s surface. living resources, at the same rate that it is consumed . model - pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept. forest soil - soil that forms under a cover of leaves and other plant remains and contains very little humus. retrovirus - microscopic organism that can cause tumors and diseases in animals and people;  they contain RNA and use it to uniformitarianism - idea that geologic processes that occurred in the past can be explained by current geologic processes. machine - any device that makes doing work easier. endoplasmic reticulum (ER) - maze of clear tubular passageways that leads out from the nuclear membrane; involved in the How ?                 point; allows heavy loads to be lifted by using less force over a greater distance.  growth - stage in the process of growing; a measure of progressive development. an Activity, Play and Learn percolation - movement of water through rock or soil. bile - substance produced by the liver that aids in digestion. vertebrate - animal with a backbone; only about 3 percent of animals are vertebrates. organelle - parts that make up a cell. social behaviors - interactions among organisms of the same species, including courtship and mating, caring for the young, and force - quality that tends to produce movement or acceleration of a body in the direction of its application; push or a         pull; can be environment - sum of conditions affecting an organism, including all living and nonliving things in an area, such as plants, Rock from which the planet is closest to the surface with ice plant animal! 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