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B40b. SEAFLOOR SPREADING. Atlantic Getting Bigger. SEAFLOOR SPREADING. Idea that the ocean bottom is getting larger. Atlantic Ocean Proposed by Harry Hess Evidence in rocks on ocean floor. mid-ocean ridge found running down center of Atlantic Ocean series of mountains on either side.
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B40b SEAFLOOR SPREADING Atlantic Getting Bigger
SEAFLOOR SPREADING • Idea that the ocean bottom is getting larger. • Atlantic Ocean • Proposed by Harry Hess • Evidence in rocks on ocean floor.
mid-ocean ridge found running down center of Atlantic Ocean series of mountains on either side MID-ATLANTIC RIDGE
1 - youngest rocks nearest the ridge oldest rocks next to continents identical pattern on both sides THEREFORE: new rocks are forming ROCK AGES (B3, Figure 9)
2 - oldest rocks on ocean floor = 200 million years old oldest rocks on continents = 4.6 billion years old THEREFORE: new rocks are forming (B3, Figure 9)
rocks on ocean bottom reflect earth’s magnetic reversals THEREFORE: new rocks are forming MAGNETIC REVERSAL INDICATORS (B3, Figure 10)
ASSIGNMENT • Draw a section of the ocean floor and mantle flanking the mid-Atlantic ridge. • Use different colors to represent different rock ages. • Label: mid-Atlantic ridge and direction of plate movement.
"Kama ""Likes"" ni ""Views"" ya ""B4B""" Kuenea kwa sakafu ya bahari. Bahari ya Atlantiki Inazidi Kubwa. Kuenea kwa sakafu ya bahari. Wazo la kwamba sakafu ya bahari inazidi kuwa kubwa. Bahari ya Atlantiki Iliyotolewa na Harry Hess Uthibitisho katika miamba kwenye sakafu ya bahari. Mto wa Mid-Ocean Ridge unaonekana kukimbia chini ya kituo cha Bahari ya Atlantiki mfululizo wa milima pande zote mbili. N.B.B.S. - The Atlantic Ocean is getting bigger and bigger. - Bahari ya Atlantiki inaendelea kupanuka. - Bahari ya Atlantiki inaendelea kupanuka. - Bahari ya Atlantiki inaendelea kupanuka. • Bahari ya Atlantiki • Iliyotolewa na Harry Hess • Uthibitisho katika miamba kwenye sakafu ya bahari. Mwamba wa Atlantiki ni mti wa zamani zaidi wa bahari ya Atlantiki, na mamba wa zamani zaidi ya bahari ya Atlantiki ni mamba wa zamani zaidi ya bahari ya Atlantiki, na mamba wa zamani zaidi ya bahari ya Atlantiki ni mamba wa zamani zaidi ya bahari ya Atlantiki. • Tumia rangi tofauti-tofauti ili kuwakilisha umri tofauti-tofauti wa miamba. • Label: katikati ya Atlantic ridge na mwelekeo wa harakati ya sahani.