How do spring tides and neap tides differ , what causes them ?

A spring tide is when the difference between a low and high tide is the greatest while a neap tide is when the difference between the low and high tide is the lowest. 

Spring tides occur during the full or new moon, and when the moon, Earth, and the sun are aligned. The collective gravitational pull on the Earth's water is strengthened during the alignment of the moon, Earth, and the sun.

Neap tides occur when the moon and the sun are at the right angle to the Earth, which occurs twice a month. The total gravitational pull on the Earth's water during this time is lesser since the gravitational pull comes from two different directions. 

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is correct hope this   also i learnd this in middle school

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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