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Unit One Review

1) AN OBSERVATION always involves the use of the senses. Instruments may extend the senses.
2) AN INFERENCE is an interpretation or conclusion based on observations.
Inferencesusually involve what happened in the past. Any statement about the future MUST be an inference.
3) CLASSIFICATION is the grouping of items based on common characteristics.
We classify things to make them easier to study and to understand.
4) MEASUREMENT:
    A) Mass: The amount of matter in an object. The basic unit of mass is the gram.
    B) Volume: The amount of space occupied by an object. The basis units of volume arethe cm3 and  ml.
    They are equal.
5) DENSITY: Amount of mass per unit of volume. You MUST be able to solve for any value in the density formula.
    a) Expressed in g/cm3 or g/ml
    b) Cut object into many pieces and the density of each piece remains the same.
    c) Compress an object (reduce its volume) and the density increases.
    d) When an object expands (increases in volume) its density decreases.    
    e) The density of water is 1 g/cm3 (1 g/ml)
    f) Water reaches maximum density at 4 oC (really 3.98oC)
6) You MUST be able to calculate percent error (deviation) using the formula.
7) PHASES of MATTER:
    a) Solid (usually most dense)
    b) Liquid
    c) Gas or vapor (least dense)
8) CHANGES are EVENTS that occur (can be  in) "time and space" (frames of reference).
    a) Rate of change varies greatly. Some are fast (earthquakes). Some are slow (evolution).
    b) Changes may be cyclic; repeating again and again. Cyclic changes like the phases of the moon are predicable.         1) Predictions are most accurate when data is gathered over a long period of time.
    c) Changes may be non-cyclic; these are one time events such as meteorite impacts which are usually not                         predictable.
    d) All changes involve a flow of energy. Energy is exchanged at an interface. An interface is a boundary between         two different materials (land and water, air and land).
    e) The “law of conservation of energy” states that “Energy cannot be destroyed but one kind of energy can be                 changed into another.” Example: Sunlight falls on your face. It is changed from light to heat. You feel the                     warmth of the sun. 
9) RATE: the amount of change per unit of time. RATE = SLOPE = GRADIENT. When     you look at a graph, the steeper the line, the faster the rate.
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  • Home
  • Earth Sci Labs
  • 7th Grade ON-LINE TEXTBOOK
  • 7th Grade
    • 7th grade Lab Reports
    • Current events
    • 7th 1- Scientific Theory
    • 7th Lanforms & Maps >
      • Mountain Project
      • Mineral/ Gem Project
    • 7th 3- Geology >
      • Weathering & Erosion
      • Fossil Project
      • Plate Tectonics
      • Earthquakes
      • Unit Test Review
    • 7th Unit 4 Atoms >
      • 7th Atom Brochure
  • Earth Science by topic
  • Submit Homework
  • 8th Grade Units 1-4
    • Unit 1 Models of the Earth >
      • Metric Review
      • Chapter1 Review
      • Chapter 2
      • Topographic Maps
    • Unit 2 Rocks & Minerals >
      • Minerals
      • Rocks
    • Unit 3 Dynamic Crust >
      • Earthquakes
      • Earthquakes & Interior
      • Hot Spots
      • Volcano
      • Dynamic Crust Review >
        • Practice Tests
    • Unit 4 Shaping the Earth's Surface >
      • Weathering
      • chemical weathering
      • Another Weathering video
      • Erosion Videos
      • Glaciers >
        • Glacier Pwr points
      • Changing Earth
      • Unit Review
  • 8th Grade Units 5-9
    • Unit 5 Earth History >
      • Archean History
      • Geological Eras
      • Geologic Sequence Project
      • Unit 5 Review
    • Unit 6 & 7 Climate & Meteorology >
      • 801 Vacation Work
      • Weather Tracking HW Lab
      • Meteorology info
      • Station Models
      • Wind
      • Storms
      • Weather & Climate Review Tests
    • Unit 8 Earth & Space
  • 801 Test Review
  • Ways to pass the regents
  • files
  • Other Important Links
  • New Page