Sky High

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Questions and Answers

Which gas makes up the majority of Earth's atmosphere?

  • Hydrogen
  • Oxygen
  • Carbon dioxide
  • Nitrogen (correct)

What causes the blue color of the sky during the day?

  • Presence of clouds
  • Scattering of sunlight by the atmosphere (correct)
  • Reflection of the ocean
  • Absorption of sunlight by the atmosphere

What is the layer of the Earth's atmosphere where weather occurs?

  • Thermosphere
  • Troposphere (correct)
  • Stratosphere
  • Mesosphere

What is the primary ingredient in concrete?

<p>Cement (B)</p> Signup and view all the answers

What is the process called when concrete hardens and becomes durable?

<p>Hydration (A)</p> Signup and view all the answers

What is the purpose of adding aggregates to concrete?

<p>To improve the durability (B)</p> Signup and view all the answers

What is the typical ratio of water to cement in concrete?

<p>3:1 (A)</p> Signup and view all the answers

What is the purpose of curing concrete?

<p>To make it more durable (A)</p> Signup and view all the answers

What is the most common type of reinforcement used in concrete construction?

<p>Steel bars (B)</p> Signup and view all the answers

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