Read the excerpt from part 2 of "to build a fire."
he should not have built the fire under the spruce tree. he should have built it in the open. but it had been easier to pull the twigs from the brush and drop them directly on the fire. now the tree under which he had done this carried a weight of snow on its boughs. no wind had blown for weeks, and each bough was fully freighted. each time he had pulled on a twig he had communicated a slight agitation to the tree—an imperceptible agitation, so far as he was concerned, but an agitation sufficient to bring about the disaster. high up in the tree one bough capsized its load of snow. this fell on the boughs beneath, capsizing them. this process continued, spreading out and involving the whole tree. it grew like an avalanche, and it descended without warning upon the man and the fire, and the fire was blotted out!

this is an example of which type of conflict?