Answer: Option D. -> low escape velocity of air molecule and low gravitational attraction
Answer: (d)

Answer: Option B. -> Along divergent plate boundaries, subduction carries plates into the mantle
Answer: (b)
Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust.
Tectonic plates are able to move because the Earth’s lithosphere has greater strength than the underlying asthenosphere. The outer shell of the earth, the lithosphere is broken up into tectonic plates.
The seven major plates are the African plate, Antarctic plate, Eurasian plate, Indo-Australian plate, North American plate, Pacific plate, and South American plate. Along convergent boundaries, subduction carries plates into the mantle.

Answer: Option D. -> 6000 °C
Answer: (d)
The surface of the sun is called the photosphere. The photosphere is 340 miles thick and its temperature s ranges from 5,500°C to 6,000°C.
It has dark spots called sunspots which are the only solar activity observable by the naked eye.

Answer: Option D. -> innermost layer of the earth
Answer: (d)
Nife refers to the earth’s core or the material composing it. It is mainly rich in Nickel and Iron.

Answer: Option C. -> Eight
Answer: (c)
There are 8 planets of the solar system that revolve around the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Pluto was stripped of its planetary status and categorized as a ‘dwarf planet’ by the International Astronomical Union in 2005.

Answer: Option C. -> Mercury - Mars - Venus - Earth - Uranus
Answer: (c)

Answer: Option B. -> Asteroids
Answer: (b)The group of small pieces of rocks revolving round the sun between the orbits of Mars and Jupiter are called asteroids.

Answer: Option D. -> 8 min 18 sec
Answer: (d)On an average Sunlight reaches on Earth in 8 min. 20 sec.

Answer: Option D. -> 1 only
Answer: (d)The sun is the heart spot of the Solar system which is the source of energy of all organisms on Earth. Our sun is the center of our solar system and is the source of all energy for almost every organism on the face of the Earth.The sun provides a vast spectrum of energy. Everyone knows that the sun produces lots of heat and light. But our sun produces energy that is much more important. The vast amount of energy that our sun produces is called RADIANT ENERGY.Radiant energy is defined as invisible and invisible light; it is also energy that travels in waves. directly or indirectly, the sun provides nearly all of the energy required by the organisms on Earth. The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere).The temperature in the corona is 500,000 K (900,000 degrees F, 500,000 degrees C) or more, up to a few million K.

Answer: Option D. -> Kepler’s second law
Answer: (d)Kapler’s law give a description of the motion of planets around the Sun.Kepler’s are laws areThe orbit of every planet is an ellipse with the Sun at one of two faces.A line joining a planet and the Sun sweeps out equal areas during intervals of time.