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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?

Cement Signup and view all the answers

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

Hydration Signup and view all the answers

What is the purpose of adding aggregates to concrete?

To improve the durability Signup and view all the answers

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

3:1 Signup and view all the answers

What is the purpose of curing concrete?

To make it more durable Signup and view all the answers

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

Steel bars Signup and view all the answers

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Questions and Answers

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

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

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

What is the primary ingredient in concrete?

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

What is the purpose of adding aggregates to concrete?

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

What is the purpose of curing concrete?

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

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