Music Theory
Music theory.net: The Major Scale
A terrific reference for music students and teachers! Explains the fundamentals of the major scale, provides diagrams, and audio clips to help children recognize this piece of music theory.
CK-12 Foundation
Ck 12: Earth Science: Geologic Time Scale Study Guide
Take a quick look at Earth's geologic time scale.
Talk Origins Archive
Talk Origins Archive: Radiometric Dating and the Geological Time Scale
A lengthy article with lots of information about radiometric dating, including pictures and charts.
CK-12 Foundation
Ck 12: Measurement: Scale Distances or Dimensions
[Free Registration/Login may be required to access all resource tools.] Recognize unit scale as a ratio between units of measure of scale dimension to actual dimension.
Illustrative Mathematics
Illustrative Mathematics: A rei.c.6: Accurately Weighing Pennies Ii
This illustrated math lesson shows how important levels of accuracy in measurement are. The answer can be different since a scale only accurately weighs to the nearest tenth of a gram instead of to the nearest hundredth of a gram. Aligns...
CK-12 Foundation
Ck 12: Earth Science: Scales That Represent Earthquake Magnitude Study Guide
[Free Registration/Login may be required to access all resource tools.] Provides a summary of methods used to measure earthquakes. Includes some questions to check for understanding.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Area Builder
Create shapes using colorful blocks, and explore the relationship between perimeter and area. CCSS.Math.Content.3.MD.C.7.a Find the area of a rectangle with whole-number side lengths by tiling it
Concord Consortium
Concord Consortium: Stem Resources: States of Matter
Using simulations observe what solids, liquids, and gases look like at the atomic scale. After observing the different states of matter at their atomic level, students will be able to conclude about the forces and attractions that exist...
BBC
Bbc Bitesize: Gcse Edexcel: Probability
Find out how probabilities are written as fractions, decimals or percentages on a scale from 0 to 1. Knowing basic facts about equally likely outcomes can help to solve more complicated problems.
ClassFlow
Class Flow: Musical Notation
[Free Registration/Login Required] This flipchart is an introduction to the music staff and notation. It describes the notes on both the treble and bass clefs. Sound files for each pitch of a C scale and some Activote questions are...
CK-12 Foundation
Ck 12: Geometry: Polygon Similarity Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide looks at similar polygons, scale factor (ratio), and triangle similarity.
CK-12 Foundation
Ck 12: Elem Math: Visually Find the Weight in Compound Units for Multiple Items
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to read the scales for two items and record the weights in compound metric units. [1:22]
CK-12 Foundation
Ck 12: Elem Math: Visually Finding Weight in Compound Units
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to read a scale and record the weight in compound metric units. [1:08]
Curated OER
Wikipedia: National Historic Landmarks in Washington, d.c.: General Post Office
This post office is a fine example of restrained Neoclassical design. Built in phases between 1839 and 1866, the building features beautiful scaling and fine details.
BBC
Bbc: Gcse Bitesize: Types of Chemical Reactions
Bases are substances that can react with acids and neutralize them. Alkalis are bases that are soluble in water. The pH scale measures how acidic or alkaline a substance is. Substances with a pH lower than 7 are acidic, those with a pH...
Khan Academy
Khan Academy: An Introduction to Ancient China
We will refer to Ancient China as the time between the Neolithic period (ca. 6,000-ca. 1750 B.C.E.) and the Han dynasty (206 B.C.E.-220 C.E.), This is the formative stage of Chinese civilization. During this time, what we now call China...
TED Talks
Ted: Ted Ed: Is There a Limit to Technological Progress?
Many generations have felt they've reached the pinnacle of technological advancement. Yet, if you look back 100 years, the technologies we take for granted today would seem like impossible magic. So- will there be a point where we reach...
Other
Rensselaer Polytechnic Institute: Chemical Equilibrium
This site from the Rensselaer Polytechnic Institute provides an introduction to chemical equilibrium, covering equilibrium expressions, the pH scale, and presenting how to plot log concentration diagrams.
Other
Wuppertal Institute: Towards a Global Energy Transformation [Pdf]
This study analyzes the deepening crisis in the availability of global energy resources and looks at ways to transform how we produce and use energy in order to create a sustainable development model. They state that "Socially just and...
BBC
Bbc Skillswise: Probability
Use fractions and percentages to solve probability problems. Skillswise provides five factsheets, four quizzes, four worksheets, and a game pertaining to probability.
CK-12 Foundation
Ck 12: Vector Scalar Product: Vector Multiplied by a Scalar
[Free Registration/Login may be required to access all resource tools.] Represent scalar multiplication graphically by scaling vectors and possibly reversing their direction; perform scalar multiplication component-wise. Compute the...
CK-12 Foundation
Ck 12: Geometry: Ratios and Proportions Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide reviews ratios, proportions, and cross-multiplication.
CK-12 Foundation
Ck 12: Biology: Evolution of Multicellular Life Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on the evolution of multicellular life.
Khan Academy
Khan Academy: Egyptian Mummy Portraits
This type of portrait appeared in Egypt in the first century C.E., and remained popular for around 200 years. Egyptian mummy portraits were placed on the outside of the cartonnage coffin over the head of the individual or were carefully...