Gr 9 NATURAL SCIENCES: CH 4.4 The troposphere

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What is the average thickness of the troposphere?

20 km
6 km
12 km (correct)
18 km

What is the main reason for the air movement in the troposphere?

Warming of the Earth's surface (correct)
Gravity
Earth's rotation
Cooling of the Earth's surface

At what altitude does the temperature in the troposphere reach approximately -60°C?

5-6 km
15-17 km
20-22 km
10-12 km (correct)

What percentage of the atmosphere is composed of oxygen?

20.95% (D) Signup and view all the answers

What marks the boundary between the troposphere and the stratosphere?

A stabilization of temperature (A) Signup and view all the answers

What is the main characteristic of the air density in the troposphere?

It decreases with altitude (A) Signup and view all the answers

What is a key characteristic of the troposphere that influences global weather patterns and climate?

Decreasing temperature gradient (A) Signup and view all the answers

What is the result of the Earth's rotation on the troposphere?

A varying thickness around the globe (D) Signup and view all the answers

What occurs in the troposphere due to its decreasing temperature gradient?

Convection currents are formed (C) Signup and view all the answers

What is the primary role of the troposphere?

To support all life on Earth and host all weather phenomena (A) Signup and view all the answers

What is the primary component of the air in the troposphere?

Nitrogen (C) Signup and view all the answers

Why does the air in the troposphere move?

Due to the warming of the Earth's surface (C) Signup and view all the answers

What is the result of the convection currents in the troposphere?

Cloud formation and weather patterns (D) Signup and view all the answers

What is the characteristic of the troposphere that allows humans to breathe?

High air density (A) Signup and view all the answers

What is the typical pattern of temperature change in the troposphere?

The temperature decreases with altitude (C) Signup and view all the answers

What is the primary function of the transition zone between the troposphere and the stratosphere?

To trap the warm and moist air in the troposphere (B) Signup and view all the answers

What is the significance of the troposphere's decreasing temperature gradient?

It results in the creation of convection currents (C) Signup and view all the answers

How does the Earth's rotation affect the troposphere?

It results in the troposphere being thicker near the equator (C) Signup and view all the answers

What is the troposphere's primary role in supporting life on Earth?

It hosts all weather phenomena and supports life through its dynamic processes (B) Signup and view all the answers

What can be inferred about the temperature profile of the Earth's atmosphere?

It stabilizes and then increases with altitude (D) Signup and view all the answers

What is the primary consequence of the stabilization of temperature at the boundary between the troposphere and the stratosphere?

A barrier is formed, preventing warm air from escaping the troposphere. (C) Signup and view all the answers

What is the direct result of the convection currents in the troposphere?

The distribution of heat around the globe. (D) Signup and view all the answers

What is the primary factor influencing the varying thickness of the troposphere?

Earth's rotation. (C) Signup and view all the answers

What is the characteristic of the troposphere that supports all life on Earth?

Its ability to support all weather phenomena. (D) Signup and view all the answers

What is the significance of the temperature profile of the Earth's atmosphere?

It affects the Earth's climate. (D) Signup and view all the answers

What is the primary driver of the convection currents in the troposphere?

The warming of the Earth's surface (D) Signup and view all the answers

What is the approximate percentage of nitrogen in the air we breathe in the troposphere?

78.08% (C) Signup and view all the answers

What is the characteristic of the troposphere that allows for the formation of clouds and weather patterns?

Its constant air movement (C) Signup and view all the answers

What is the approximate rate of temperature decrease with altitude in the troposphere?

6.4°C/km (C) Signup and view all the answers

What is the approximate altitude range of the troposphere at the equator?

12-18 km (B) Signup and view all the answers