Cross Unit Connections for Science Midterm

Unit 1: Density
1. density differences also cause ocean currents
2. density of water: 1 <1 floats, >1 sinks
3. specific gravity
4. water displacement
5. as altitude increases, density of air decreases
  1. less molecular collisions; as altitude increases, temp of air decreases
Unit 2: Heat Transfer
1. raditation from sun heats air in atmosphere
2. heat added to substance (solid, liquid)= more motion= more volume (= less density)
Unit 3: Electricity
1. electrical energy: flows through circuit thermal energy: resistance
2. chemical energy from battery becomes electrical energy in circuit
Unit 4: Rock Cycle
1. basalt (oceanic plate) denser than granite (land plate) causes subductiom
  1. (rock density differences)
2. (weathering and erosion)
  1. weathering and erosion causes salt in water (salinity)
    1. *salt water is denser than freshwater
      1. *salt water has a slightly higher boiling point than freshwater
3. (plate tectonics)
Unit 5: Water Cycle (water chemistry)
1. winds caused by density differences in hot and cold air
2. surface tension defies this...
Unit 6: Carbon Cycle
1. (water needed for these chemical equations)
  1. plants turn electromagnetic energy from the sun into chemical energy (sugar) through photosynthesis
    Nota:
    - and thermal?
    1. (carbon consumed by

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