Constructed Response (3 paragraphs) 30 pts Water is a very common substance on Earth, covering over two-thirds of its surface. But less than one percent of the water on Earth is fresh water that can be used by humans. As human populations grow, the stress on water resources will continue to increase.

Describe how we as a global community might come together to save more water or use water that needs to be processed to consume (ocean water for example)

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.