A dog, Skipper, is roaming around in his neighborhood. Skipper passes one of his favorite spots and he lifts his leg to urinate on a fire hydrant. Which two body systems interact

etty McGuire is no stranger to dog urine. If you live with a dog, neither are you. I’m guessing your dog pee story is probably one of waiting: Waiting while your dog checks out another dog’s pee, or waiting while your dog leaves a deposit. And who hasn’t experienced the occasional, “Ack! Why did you pee there?!?” followed by a cleaning session. But if you’ve ever gazed at a peeing dog and asked yourself any number of “Why” questions, Betty McGuire is the person for you.

McGuire, a researcher and

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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