Question

please answer these questions ​

Answer 1

1a the study of past is known as history

Answer 2

Answer:

1. Fill in the blanks:

a) History

b)Anno Domini

c) Birch tree

d)The Pleiades

e) natural and man-made

2) Match the following:

a) Sachin stupa - monument

b) Neil Armstrong - First man of the Moon

c) Venus - Natural Satellite

d) Moon - Brightest Planet

e) Mars - Natural Satellite

Explanation:

3) Answer the following questions:

a) Historical sources include documents, artifacts, archaeological sites, features. oral transmissions, stone inscriptions, paintings, recorded sounds, images (photographs, motion picture), and oral history. Even ancient relics and ruins, broadly speaking, are historical sources.

b) The four inner planets have slower orbits, slower spin, no rings, and they are made of rock and metal. The four outer planets have faster orbits and spins, a composition of gases and liquids, numerous moons, and rings. The outer planets are made of hydrogen and helium, so they are called gas giants.

c) History is the study of the past. Events occurring before the invention of writing systems are considered prehistory. "History" is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events.

d)The main difference between stars and planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—usually they burn hydrogen in their cores, releasing massive amounts of energy. In order to be hot enough for these reactions to take place, stars need to be extremely big. They must have a mass of at least 75 times that of Jupiter, the largest planet in the Solar System. Because they radiate energy, stars are very bright objects. Planets do not generate their own energy through nuclear reactions. They reflect some of the radiation coming from their parent star.

e) Though there are several celestial bodies in the Solar system to have a hydrosphere Earth still is the only celestial body known to have stable bodies of liquid water on its surface, with oceanic water covering 71% of its surface, and liquid water is essential to all known life forms on Earth.

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