Week 1 Structure of the Earth
Task 1 Thinking Science Lesson 26  Compound Variables
Explore the relationship between;
 Force (weight) per unit surface area is pressure
 mass per unit volume is density
 volume of solute per volume of solution is concentration
Task 2 Density: a compound variable
Year 8 Text pages 221 to 227
Read the pages.
Write the subheading on the Rightside of your Science Notebook.
Make dot point notes and diagrams beneath each subheading.
Write the subheading on the Rightside of your Science Notebook.
Make dot point notes and diagrams beneath each subheading.
Task 3 Exploring density of materials.
Complete this activity on the Leftside page.

Pop Quiz Density  Leftside
1. Density is a compound variable. It depends on two other variables; _______________________ and _________________________ .
2. The relationship between these variable may be expressed in an equation. D = m/ V (g / cm3)
3. The relationship between density and mass is _______________________________________ .
4. The relationship between density and volume is _____________________________________ .
5. Use the formula to calculate the density at 25 degrees C of each of the following. Show the steps in the calculation.
a) a cube of lead with a mass of 91.2g and a volume of 8.0 cm3
b) a cube of aluminium with a mass of 150g and a volume of 55.6cm3
c) a cube of carbon with a mass of 100g and a volume of 43.5g
2. The relationship between these variable may be expressed in an equation. D = m/ V (g / cm3)
3. The relationship between density and mass is _______________________________________ .
4. The relationship between density and volume is _____________________________________ .
5. Use the formula to calculate the density at 25 degrees C of each of the following. Show the steps in the calculation.
a) a cube of lead with a mass of 91.2g and a volume of 8.0 cm3
b) a cube of aluminium with a mass of 150g and a volume of 55.6cm3
c) a cube of carbon with a mass of 100g and a volume of 43.5g
Task 4 Elaboration of the concept of density
Changes to the density of materials
Primary and Secondary Data
Aurora
Interaction of the solar flare with the ionosphere of the earth produces colours. Strikingly beautiful night skies from New England and elsewhere  a blaze of aurora colors. Images provided to the Washington Post. http://wapo.st/1qOkvOn Images courtesy of the Washington Post. 
Significant Flare Surges Off the Sun
The sun emitted a significant solar flare, peaking at 1:48 p.m. EDT on Sept. 10, 2014. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground. However  when intense enough  they can disturb the atmosphere in the layer where GPS and communications signals travel. They can also produce spectacular auroras because solar storms add to the number of solar particles that interact with the Earth's atmosphere. The relatively high predicted of the storm means it may be possible to see the aurora as far south as the northern U.S. states, including Wisconsin, Michigan, and New York. This image was captured by NASA's Solar Dynamics Observatory and shows light in the 131 Angstrom wavelength, which is typically colorized in teal.
Read more about the flare from NASA at http://www.nasa.gov/content/goddard/significantflaresurgesoffthesun/#.VBLdNyQft7p To see how this event may affect Earth, visit NOAA's Space Weather Prediction Center at http://spaceweather.gov/ Find answers to frequently asked questions about solar storms at http://www.nasa.gov/mission_pages/sunearth/spaceweather/index.html#q1 