Who's Elisa, and what book and/or passage are you reading? Nobody can answer without that context.
Answer:
A preposition is a word that: is placed before a noun or pronoun or gerund shows a relationship of the noun or pronoun with something else.
Explanation:
<span>the basis for physical fitness is good eating habits. what we eat has a lot of effect in our body. eating unhealthy foods may limit us from doing the things that we need to do. Unhealthy foods weaken us, our body. that's why we need to eat healthy foods for us to be able to increase our physical strength and also for us to be able to do the things we really love.</span>
Answer:
According to the General Theory of Relativity, a black hole is a region of space from which nothing, not even particles that move at the speed of light, can escape because their velocity is less than the escape velocity of these infinitely dense celestial bodies . This is the result of the deformation of space-time, caused after the gravitational collapse of a massive star with at least 30 times the mass of the Sun in a supernova, and that soon after, will disappear, giving place to what Physics calls singularity, the heart of a black hole, where space-time ceases to exist. A black hole starts from a spherical surface called the event horizon, which marks the region from which, if something to cross, can not return. The black adjective in black hole is due to the fact that it was assumed that it did not reflect any part of the light that reaches its horizon of events, acting as if it were a perfect black body in thermodynamics, however, there is currently the theory of radiation Hawking, who briefly predicts that black holes are not really black, and emit radiation due to quantum effects such as quantum fluctuations.
Explanation:
