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Earth and Physical Science Flashcards

6 cards from real AST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Earth and Physical Science flashcards as text

  1. Which gas makes up the largest percentage of Earth's atmosphere?

    Answer: Nitrogen

    Nitrogen makes up approximately 78% of Earth's atmosphere.

  2. The principle that physical and chemical processes operating today also operated in the past is called:

    Answer: Uniformitarianism

    Uniformitarianism is the principle that geological processes have been consistent throughout Earth's history.

  3. When an object is in free fall (ignoring air resistance), what force acts on it?

    Answer: Gravity only

    In free fall with no air resistance, only the force of gravity acts on an object.

  4. The transfer of heat through direct contact between materials is called:

    Answer: Conduction

    Conduction is heat transfer through direct physical contact between substances.

  5. A mineral's resistance to being scratched is measured by its:

    Answer: Hardness

    Hardness measures a mineral's resistance to scratching, rated on the Mohs scale.

  6. In the water cycle, the process by which plants release water vapor into the atmosphere is called:

    Answer: Transpiration

    Transpiration is the release of water vapor from plant leaves into the atmosphere.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. bsss.act.edu.au — Eligibility, exam format, passing score · verified Oct 2026
  2. bsss.act.edu.au — Test delivery, late registration, retake policy · verified Oct 2026