instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: John was playing with alkanes in his lab. If he decreased the amount of carbon atoms in an alkane, what would happen to the boiling point of that alkane? 
 Answer: decrease?
answer:
Alkanes with more carbon atoms have higher boiling and melting points, so some of them are solids at room temperature.


question:
Question: Katie has a garden and she installs a small waterfall. Since Katie sets the water to flow very slow and gentle over the sloping fall, the erosion at the bottom of the waterfall will be 
 Answer: less
answer:
A gentle slope favours slower flow of surface water, reduces erosion, and increases availability of water to plants.


question:
Question: Ian is digging in his garden, and admires the shiny pebbles sitting in the yard, as he digs a hole and finds more rocks, he knows that they are 
 Answer: older
answer:

Older rocks are at the bottom and younger rocks are at the top.