2019年ACT考试备考科学模块词汇汇总2

>>ACT考试词汇：2019年ACT考试备考科学模块词汇汇总2

>>ACT考试精品名师指导

decibel— A unit of measure for the relative intensity of sounds.

decimation— The celestial coordinate similar to that of latitude on the Earth. Declination measures how many degrees, minutes, and seconds north or south of the celestial equator an object is.

delta— A fan shaped deposit of material at the mouth of a river.

density— The mass of a substance for a given unit volume. A common unit of density is grams per milliliter (g/ml).

displacement— The change in position of an object. Computed from the final position minus the initial position. Common units of measure are meters (m).

divergent boundary— A boundary between two of the Earth's plates that are moving away from each other.

DNA— Contains all genetic material for an organism. The smallest units of DNA are called nucleotides.

ecliptic— The apparent path of the Sun across the sky over the course of a year.

electric potential energy— The energy due to an object's position within an electric field.

electromagnetic wave— A light wave that has an electric field component and a magnetic field component. An electromagnetic wave does not require a medium to travel through.

electrostatic force— The force that exists between particles due to their charge. Particles of like charge repel, particles of unlike charge attract.

element— The smallest entity that has distinct chemical properties. It can not be decomposed by ordinary chemical reactions.

ellipse— A geometric shape that is formed when a plane Is Intersected with a cone. In this case the plane intersects the cone at an angle so that a shape similar to a circle but stretched in one direction is formed. The orbits of the planets around the Sun represent ellipses.

endoplasmic reticulum— An organelle that is used to transport proteins throughout the cell.

energy— The ability to do work or undergo change. Kinetic energy is the energy of motion, while potential energy is stored energy.

enzyme — any one of the complex proteins that are produced by cells and act as catalysts in

specific biochemical reactions

epicycle—Smaller circles on which the planets traveled around the Earth in the geocentric model of the solar system. Epicycles were used to explain the retrograde motion of planets and help make the predicted positions of the planets match the observed positions.

equilibrium—A state at which the forward and reverse reaction proceed at the same rate.

focal length— The distance from a focal point to a mirror or lens.

force— That which acts on an object to change its motion; a push or pull exerted on one object by another. Common units are Newtons (N).

freefall— An object in one-dimensional motion that is only acted on by the force of the Earth's gravity. In this case its acceleration will be -g or g downward.

frequency— The number of cycles or repetitions per second. Frequency is also often measured as the number of revolutions per second. The common units of frequency are Hertz (Hz) where one Hertz equals 1/second.

frictional force— The force that acts parallel to surfaces in contact opposite the direction of motion or tendency of motion.

functional group— A group of atoms that give a molecule a certain characteristic or property.

gel electrophoresis—A process used in laboratories to determine the genetic makeup of DNA strands. This process involves the movement of chromosomes through a gel from one pole to the other. Magnetism is used to pull the chromosomes through the gel.

geology— The study of rocks and minerals. glacier— A large mass of snow-covered ice.

golgi apparatus—An organelle that packages proteins so that they can be sent out of the cell.

gravitational force— The attractive force that exists between all particles with mass. heliocentric model— The model of the solar system that places the Sun at the center with the planets orbiting around it.

heterogeneous— A mixture that is not uniform in composition. homogeneous— A mixture in which the components are uniformly distributed.

上面的词汇并不多，所以还是希望你们能够全记住的，毕竟只有词汇量足够巨大，才能在考试中平步青云。另外，如果对于19年ACT考试时间有不了解，那就来坦途网ACT考试频道吧，小编和坦途网一直陪在你们的备考路上的，与你们共进退！