In this task you will be given a process, and a question. The process contains a sequence of steps that happen in order. The question asks about the effect of a certain event on another event. If the first event has a positive effect on the second event, answer with "for", if it has a negative effect, answer with "against". If there's no causal relationship between the two, answer with "none".

Process:  -Plants start growing on or near the rocks -The roots of the growing plants start to break up the rock -The plant acids dissolve the rock -The rock is broken down into smaller pieces -Erosion begins.
 Question: What is the effect of people and animals remove plants on less plants grow on the rocks.?
for

Process:  -A fuel is heated in an oven -Above the oven is a tank of water that is sealed -The tank of water begins to boil above the oven -A the water boils steam is created -The steam is denser than air so it needs a place to go -The steam is forced out of the tank and into a piston -The piston moves up -The valve of the piston closes -The valve on the next piston opens -The steam fills the next piston, driving it up, and the other one down -
 Question: What is the effect of the skin is not so badly damaged on less power produced by the steam engine.?
none

Process:  -Greenhouse gases are released into the air by human activities -The earth changes energy from the sun into heat -Heat rises from the ground -Greenhouse gas molecules in the atmosphere prevent the heat from going into space -The temperature of the earth increases -The temperature continues to rise and melts the polar ice caps -The temperature rises even faster.
 Question: What is the effect of the rock has deep cracks water can get into on a smaller greenhouse effect.?

none