In a well developed essay that includes a short introduction and conclusion, analyze the poem below for its use of imagery and tone, and how they contribute to the theme.

In  a well developed essay that includes a short introduction and  conclusion, analyze the poem below for its use of imagery and tone, and  how they contribute to the theme. You will be graded in the following  areas: 1] clear main ideas (clear thesis, strong examples from the poem  to support your analysis.) 2] well-developed sentences 3] grammar and  word choice 4] organization (transitions, sequence of ideas, how the  body helps prove the thesis). Use quotes from the poem to support your  interpretation.Even though you should not use any sources other than the poem, the essay still should follow MLA formatting guidelines. 

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The poem is below. 

Natural Bridge/Rogue River Canyon

                By Paul Halupa

Life surges incessantly towards impediment.

Passages narrow and the resultant

End is hard stone.

On the upper Rogue River, the wall is lava, ancient spills

Left by Mazama against the high hills.

I am alone

And my reflection is dominated by water

Coming to impasse, the teeter-totter

Of decision.

The wall of lava and its field might produce a lake

Or bow the river wide around and make

A revision

In its course, delay its certain bubbling intention

To go forward. But it is invention

That is the mark:

The river hits the wall as if to drive it asunder

And finding a chute beneath, dives under

Into the dark.

And in review it would seem, for us, little different.

Difficulties mount, pressures build, a rent

Is in the wall,

And plunging in we find a serene cavernous strength,

And pressed to run its darkness at full length,

We find our all.