Grade 11 Earth Science Quiz

What is a closed system?

• Allows energy and matter to flow in and out

• Is self-contained

• Is a type of ecosystem

• Is a geological formation

Answer explanation

A closed system is defined as being self-contained, meaning it does not allow energy or matter to flow in and out. This distinguishes it from open systems, which do allow such exchanges.

What percentage of the Earth's atmosphere is composed of nitrogen?

• 21%

• 50%

• 78%

• 0.9%

Answer explanation

Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant gas. The other options, such as 21% (oxygen) and 0.9% (argon), are incorrect.

Which layer of the atmosphere is known for containing the ozone layer?

• Thermosphere

• Mesosphere

• Stratosphere

• Troposphere

Answer explanation

The ozone layer, which protects us from harmful UV radiation, is located in the stratosphere. This layer lies above the troposphere and below the mesosphere, making the stratosphere the correct answer.

What is the primary component of the hydrosphere?

• Atmospheric moisture

• Liquid water

• Ice

• Freshwater

Answer explanation

The hydrosphere primarily consists of liquid water, which covers about 71% of the Earth's surface. While ice and atmospheric moisture are present, liquid water is the dominant component essential for life.

What is the deepest known point in the Earth's oceans?

• Mariana Trench

• Great Barrier Reef

• Challenger Deep

• Mid-Atlantic Ridge

Answer explanation

The deepest known point in the Earth's oceans is Challenger Deep, located in the Mariana Trench. While the Mariana Trench is the trench itself, Challenger Deep is the specific point that reaches the greatest depth.

Which part of the geosphere is the outermost layer?

• Mantle

• Crust

• Outer Core

• Inner Core

Answer explanation

The crust is the outermost layer of the geosphere, lying above the mantle. It is the solid surface of the Earth where we live, while the mantle, outer core, and inner core are located beneath it.

What is the main characteristic of the tundra biome?

• High rainfall

• High biodiversity

• Dense forests

• Cold temperatures

Answer explanation

The tundra biome is characterized by cold temperatures, which limit plant growth and result in a landscape dominated by mosses, lichens, and low shrubs. This distinguishes it from biomes with high rainfall or dense forests.

What is the primary function of the biosphere?

• Storing carbon

• Supporting all life forms

• Regulating climate

• Providing minerals

Answer explanation

The primary function of the biosphere is to support all life forms by providing the necessary conditions and resources for their survival, growth, and reproduction, making it essential for biodiversity.

Which layer of the atmosphere is where meteoroids burn up?

• Troposphere

• Thermosphere

• Mesosphere

• Stratosphere

Answer explanation

Meteoroids burn up in the mesosphere, which is located between the stratosphere and thermosphere. This layer is where friction with atmospheric gases causes meteoroids to heat and disintegrate.

What is the main process by which heat is redistributed on Earth's surface?

• Evaporation

• Conduction

• Convection

• Radiation

Answer explanation

Convection is the main process for heat redistribution on Earth's surface, as it involves the movement of warm air and water, transferring heat from warmer to cooler areas, unlike conduction, radiation, or evaporation.