How does conditioning change a material?

How do you get dirt stains off the bottom of a vinyl pool liner when a brush will not work? What North American city has the same latitude as Barcelona Spain? How many miles is 10'000 meters? Which one of the following would not be a characteristic of the san Andreas fault zone? Why is it an advantage for a woodland plant to grow before the trees come in to leaf? What are examples of natural patterns? What type of ecosystem a robin? Are hydrogen bonds formed between all molecules? Why an atom must contain positive charges as well as negative charges.the letter should also explain why Thomson proposed the atomic model that he did? What is the seed to find herobine? What changed your formerly poisonous atmosphere into an oxygen rich atmosphere? When an object is at its highest point which energy value is highest potential or kinetic? What is the mnetric system? What is the boundary between the Piedmont and the coastal plain? Why does photosynthesis occur in plants? What molecules do not pass through the cell membrane easily while molecules pass through the membrane? How are volcanoes created at the mid-Atlantic range? How many fault lines are there in the world? How long for morning dove eggs to hatch? How many feet and inches are there in 1.67 meters?