What is the difference between systolic pressure and diastolic pressure?

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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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