Mid Year Science Review

Chemistry,Earth History,Infectious Disease


Groups-Columns (Up and down) of elements on the Periodic Table that share common properties.

Periods-The Periodic Table has 7 horizontal rows known as periods

Physical/Chemical Change

Physical Change-A change in matter in which no new substance is produced. It may involve a change of state, and it can usually be reversed

Chemical Change-A change in matter in which one or more new substances are produced. It is difficult to reserve.

Physical/Chemical Properties

Physical Change-Describes the physical characteristics of the substance

Chemical Properties- Describes how the substance reacts with other substances.

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Anything that has mass and takes up space.

Earth History

Law of Superposition

The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger then the one below it.

Relative/ Absolute Dating

Relative-The process of establishing the age of an object determine the number of years is has existed. It gives all actual number to the age.

Absolute-Exact day the rock was established.

Half Life

The length of time needed for half of the atoms of a radioactive isotope to decay.

Radioactive Dating

A technique used to date materials such as rocks or carbon, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

Index Fossil

A fossil that is used to establish the age of the rock layers.
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Ice Cores

Used to determine how Earths climate has changed over time.

Geologic Time Scale

A system of chronological measurement that relates historiography to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
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Basic building blocks for all matter

Infectious Disease


An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.


Affecting or tending to affect a disproportionately large number of individuals withing a population
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Occurring over a wide geographic area and affecting an exceptionally high proportion of the population
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Preventing A Microorganism

Wash your hands

  • Before preparing or eating food
  • After coughing or sneezing
  • After using the bathroom
  • After changing a diaper

Treating A Microorganism

You can treat some by a shot and you can not treat some.