Saturday, 26 April 2014

Think "how?" and "why?" just like a Scientist!

New Unit! Geology!

Everybody had to choose a geographical feature that they liked:

Power of the Planet Ice Oceans

  1. What are the forms of energy?  All forms of energy can be categorized as kinetic and potential.  
Potential: nuclear, gravitational, elastic, chemical, electrical potential
Kinetic kinetic of large of objects, sound, thermal, light, and electrical kinetic
  1. For the following geological features:
      1. How did they form?
      2. What were the energy changes involved in their formation?

Answer the following questions while watching the video from
  1. Describe ocean waves.
Ocean waves carry kinetic energy.  The water is just the carrier of the waves.  The water ends up in the same place; it’s the wave that moves forward.
  1. What are the energy changes involved in making most waves?
Energy of sunlight → thermal of water (different parts of the ocean and atmosphere become different temperature) → The kinetic energy of wind → kinetic energy of water
  1. What’s the energy changes involved when a wave meets the shore?
kinetic energy of water → thermal energy  and in the process there’s lots of friction which breaks down anything that is hit by the wave.
  1. How is a beach made?
A beach is made by the constant pounding of waves, wind, and the rise and fall of the tides creating smaller and smaller rocks.  When the rocks are small enough we call them sand.
  1. What are the energy changes involved in creating tides?
Gravitational of moon and sun pulling on the ocean → kinetic of the ocean
  1. How is an estuary made?
Rivers erode mountains and sides of the rivers bringing dirt/soil with it.  Where the river meets the ocean, it slows down and deposits the dirt creating the estuary.  The ocean also acts to shape the estuary with the rise and fall of the tides.  
  1. What happens to all coastal areas?
kinetic energy of water (and wind) → thermal of rock and soil

Answer the following questions while watching the video from
  1. What formed the steep, smooth cliffs?
erosion by glaciers; before the glaciers rivers carved v-shaped valleys
  1. How did it happen and what energy changes were involved?
Snow/Ice precipitates at higher elevations.  Over years it forms glaciers.  The glacier are pulled down by gravity. As they move, they scrap and erode the mountains to form steep cliffs.  Gravitational of ice → kinetic of glacier → thermal as glacier rubs against rock
12. What does the inside look like?

Ice cave.  At the bottom of the glacier is lots of sediment in the ice.  This is evidence that as the glacier moves downhill it erodes the rocks and picks up rocks in the ice.


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