Earth & its Natural Satellites - 1 - Free MCQ Practice Test with solutions,

• The solar system consists of the Sun and the celestial bodies that orbit it, including planets, moons, asteroids, and comets.
• Planets are categorized based on their distance from the Sun.
• Earth is the third planet, following Mercury (1st) and Venus (2nd).
• This position allows Earth to have the right conditions for life, including a suitable temperature and the presence of water.

The moon is a natural satellite that orbits the Earth. It is distinct from:

• Planets, which orbit the sun directly;
• Stars, which generate their own light;
• Meteorites, which are fragments entering Earth's atmosphere.

An artificial satellite is a human-made spacecraft that is designed to orbit around the Earth. It is not a natural object like the moon, which is a natural satellite of the Earth.

• The Earth is composed of several layers, with the crust being the outermost layer.
• The crust is relatively thin compared to the other layers, consisting mainly of solid rocks.
• It forms the land we walk on and the ocean floors.
• Two types of crust exist: continental crust (land) and oceanic crust (under oceans).
• This layer plays a crucial role in supporting life and geological processes.

The moon is primarily composed of rocks, specifically silicate minerals such as feldspar and pyroxene, which make up its crust.

Aryabhata was India's first satellite, launched in 1975. Bhaskara, Rohini, INSAT-2A, and CARTOSAT are some of the other Indian satellites.

Communication satellites are used to send telephone conversations and television programmes around the world. For example, the GSAT-15 is a communication satellite launched by India on 11 November 2015.

The moon appears to change its shape every day due to its phases, which occur as it orbits around the Earth.

This changing position affects how much sunlight reflects off the moon's surface, giving it the appearance of different shapes, like a crescent or a full moon.