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5 Written questions

5 Matching questions

  1. Chemical Weathering
  2. Geologic Time Scale
  3. Precambrian Time
  4. Inner Core
  5. Cenozoic Era
  1. a The process by which the chemical make-up of a rock changes.
  2. b The current era of the Geologic Time Scale. It is when mammals and humans first appeared.
  3. c The DENSEST layer of the Earth that is made of a solid ball of iron.
  4. d The section of the Geologic Time Scale that makes up 90% of Earth's History. No life existed at that time.
  5. e A timeline of earth's history. It correlates the existence of life on Earth with geological events, such as mass extinctions.

5 Multiple choice questions

  1. A gap in a rock layer. It reduces scientists understanding of Earth's history because it's a missing piece of information.
  2. The era of the Geologic Time Scale when life first appeared in the oceans. It came after Precambrian Time.
  3. When two continental plates move towards each other. They cause mountains.
  4. Long cylinders of ice used to study Earth's atmosphere. Trapped gases and dust inside the ice cores tell scientists when volcanoes erupted and how the climate used to be.
  5. the process by which rocks break apart without changing the chemical composition.

5 True/False questions

  1. Index FossilA fossil embedded in a rock layer. The age of the rock layer is the same age as the fossils embedded in it.


  2. Relative DatingDetermining the age of an object in relation to other objects ("Estimate").


  3. Mid Atlantic RidgeAn underwater mountain chain in the Atlantic Ocean caused by sea-floor spreading.


  4. Law of SuperpositionA law that states in an undisturbed rock layer, the oldest rocks are always on the bottom and the youngest rocks are always on top.


  5. Convection CurrentsThe constant rising and cooling of magma in the Earth's mantle. The heat from the inner core is what causes this motion. They cause plate movement in earth's crust.