There needs to be some more information here. It does not show the passage so not sure which piece of Thoreau's you are talking about.
Metaphors emphasis, and they help the reader visualise better :)
The room was a pool of black.A similie is where you say something is like something, a metaphor is where you say something is that thing (although we know it isn't, ha!) for greater effect for the reader.E.G of a simile and a metaphor and the differenceSIMILIE: The room is like a pool of blackMETAPHOR: The room is a pool of black
A metaphor compares one thing to something else; it DOES NOT use the words, like or as.Example: Her hair is silk. Simple and straight, the effect of metaphors is that it aims to create imagery so that we may visualize the connection between two objects or things when they are not. Metaphors are just the use of direct comparison.
Dramatic effect to make the writing seem moreimportant.
Depending on what effect you're going for or the context: Life is prolonged: Life was an eternal clock with each second ticking slower than the beating of my heart. Death is prolonged: Bathed in an endless white light I relived my entire life, death was a still ocean, and it seemed I was forever lost at sea. School is prolonged: A tortoise walked away with the school clock and the day would never come to an end.
what is the effect of friction force on plant
it rubs the steel because its friction!
No
No effect
A paragraph that introduces a cause and then lists effects of the cause.
If there is more friction with a machine, efficiency is less.
more friction = less speed
The discrimination in paragraph 4 is vivid but compressed. How does Hughes achieve this effect?
A paragraph that relates one or more causes to one or more effects
yes
less friction
Friction inhibits the motion of objects.