Earth Science PDF

Earth science Crust the outermost layer sa earth and where people inhabit Two types of crust Oceanic crust - 4 miles - Mid ocean ridge Continental crust - 6-47 miles depends sa asa makit an - Are tend to be older than the oceanic crust Seafloor spreading - Henry Hammond hess -...

Earth science Crust the outermost layer sa earth and where people inhabit Two types of crust Oceanic crust - 4 miles - Mid ocean ridge Continental crust - 6-47 miles depends sa asa makit an - Are tend to be older than the oceanic crust Seafloor spreading - Henry Hammond hess - To oceanic crust splitting away in a divergent plate boundary Evidence of seafloor spreading 1. Mountain ranges along the sealoor area and deep trenches away from ridges 2. Magnetic polarity of the seafloor changes 3. The rocks near the ocean ridge are younger than others from far away (year 1968)(Glomar challenger) 4. The oldest seafloor is younger than the oldest continenet 5. Rock pillows Features of seafloor spreading 1. Continental margins-submerged continent achuchu 2. Abyssal plain and abyssal hills- plains nya seamounts then hills are 50-300 km high common on the slopes of the mid ocean ridge 3. Mid ocean ridges- submerged mountain ranges 4. Deep ocean trenches-depression of the seafloor and the oldest feature 5. Seamounts and volcanic islands-seamounts volcano found underneath volcanic found sa itaas Continental drift theory Alfred Wegener 1912 Gikan ang earth sa isa ka ano called Pangaea The origin of the continents and oceans Evidences: The fit of the continents Similarities in the geologic units and structures Fossil match Glacial and paleoclimate evidence