Igneous Rocks- On-line Lab
By using the ESRT and your knowledge of how to identify minerals by their physical properties, you can now identify various popular minerals. Remember to look at hardness, streak, luster, cleavage, fracture and color in order to specify which mineral is which.
Minerals are the earth’s inorganic solid material that have an orderly chemical structure and can be identified by physical properties.
Minerals are aggregated to form rocks (collected together)
Scale used to identify hardness of a mineral
1 very soft (Talc- scratch with finger nail)
7 and above are extremely hard (quartz- can’t even scratch with metal object)
2 types - actual color of mineral
- the color of the streak on a piece of tile
Cleavage- is the way it breaks apart
Number of sides after we smash it or break it apart
Fracture- is the type of edges that form
Luster- how it reflects light
Specific Gravity- The density of the mineral as compared to water
Cleavage and Fracture has to do with the way it breaks
If I smash it with a hammer and it breaks in a specific way- it has cleavage
If I smash it and it doesn’t have a specific pattern- it fractures
This past week!
Over the last couple of days we focused on Topographic maps and isolines. We paid special attention to profiles and gradients. We tried our luck with an ESRT scavenger hunt. We prepared for our Unit Exam and we are now set to start our next unit on Minerals.
Focus on Topographic Maps
A topographic map is a map that allows you to see hills, mountains, slope and elevation. Elevation is how high something is.
When we talk about elevation, or height, we compare land forms to sea level. The level of the sea being 0. All elevation is either above sea level or below sea level.
A topographic map actually looks at the land and shows us elevation. We can also see how steep something is and how flat an area of land is.
A topographic map is simply a series of circular lines called contours. These contour lines can never intersect. They are called Isolines. In this case, they show elevation. The contour interval is the distance between the lines.
A topographic map will demonstrate changes in elevation. The contour lines show and tell you a big story. The closer the contours, the more steep the slope. Contour lines that are farther away from each other are gentle slopes or even flat areas.
Isolines can also be used for demonstrating other changes, like temperature zones.
Contour Worksheet done in class
Gradient Worksheet to do for HW
We will review the use of the astrolab, while focusing on Polaris and then utilize the reference tables to help us understand the basics of Earth Science
Vocabulary- Polaris, Zenith, gravity, longitude & lattitude
Earth Science Help