different between alleys vs valleys

alleys

alleys From the web:

• what alloys
• what alloys are mixed with gold
• what alloys are in stainless steel
• what alloys are used in the manufacture of medical implants
• what alloys are in 14k yellow gold
• what alloys are in sterling silver
• what alloys are in steel
• what alloys are magnetic

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valleys

valleys From the web:

• what valleys do glaciers form
• what valleys are in california
• what valleys are in the us
• what valleys are near me
• what valleys are in oregon
• what valleys are in guatemala
• what valleys are in hawaii
• what valleys do glaciers create