Explanation

Terrestrial planets are rocky planets, including Earth, Mars, Venus, and Mercury.

These planets have solid, rocky surfaces.

Unlike gas giants which are composed mainly of gases.

Explanation

Block mountains form when large sections of the Earth’s crust are uplifted or tilted along faults.

Examples include the Sierra Nevada (USA) and Vosges Mountains (France).

Explanation

Eratosthenes was the first person to calculate the Earth's radius in the 3rd century B.C.E.

He was a Greek astronomer who lived in Alexandria, Egypt.

Eratosthenes's calculation of the Earth's radius was 6,366 km, which is close to the modern value of 6,378 km.

Explanation

The Moon has no significant atmosphere — only a very thin exosphere made of trace gases like helium, neon, and hydrogen.

It lacks nitrogen and oxygen, so none of the given options are correct.

Explanation

Uranus and Neptune are termed Ice Giants because they contain large amounts of icy materials like water, ammonia, and methane.

In contrast, Jupiter and Saturn are known as Gas Giants.

Explanation

Rotation refers to the Earth spinning around its own axis.

One complete rotation takes approximately 24 hours, causing day and night.

Explanation

-40°C is the unique temperature where Celsius and Fahrenheit scales are equal.

It is calculated using the formula F = (C × 9/5) + 32, which gives -40°F.

Explanation

The Celsius scale measures temperature in degrees (°C).

It is widely used for weather, science, and daily temperature readings.

Explanation

• Red has the longest wavelength in the visible spectrum,
• Measuring roughly 620 to 750 nanometers (nm).

Additional Information:

• Yellow: Incorrect – mid-to-long range, ~570–590 nm
• Blue: Incorrect – much shorter, ~450–495 nm

Explanation

Geothermal energy derives its name from the Greek words "geo" (earth) and "therme" (heat).

It harnesses the heat generated deep within the Earth's core to produce electricity.