[:ja]米大気海洋庁NOAAが公開した、海底の年代を色で可視化したものです。赤色が新しいものを示しており、プレートが引っ張り合う裂け目では常に新たな海底が造られています。例えば大西洋では北米・南米プレートとユーラシアプレート、アフリカプレートとの境目が赤く示されています。
プレートテクトニクスは、プレート理論ともいい、地球の表面が、右図に示したような何枚かの固い岩盤（プレート）で構成されており、このプレートが、海溝に沈み込む事による重みが移動する主な力になり、対流するマントルに乗って互いに動いていると説明されます。
参考文献： Age of the Seafloor (vegetation)
ウェブ地球儀で地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders][Video] No.291: Plates on Earth
NOAA released the visualization of seafloor age. Red locations indicate young seafloors.
The surface of the Earth is a mosaic of tectonic plates that move. New sea floor is created in areas where the plates pull apart, allowing new crustal material to be formed from the molten magma below the Earth’s surface. In this dataset, red is young sea floor and purple is old sea floor (280 million years old).
Plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth’s lithosphere, over the last hundreds of millions of years. The theoretical model builds on the concept of continental drift, an idea developed during the first few decades of the 20th century. The geoscientific community accepted plate-tectonic theory after seafloor spreading was validated in the late 1950s and early 1960s.
Reference: Age of the Seafloor (vegetation)
See earthview photo gallery with web-globe: LiVEARTH[:en][Earthview Wonders][Video] No.291: Plates on Earth
NOAA released the visualization of seafloor age. Red locations indicate young seafloors.
The surface of the Earth is a mosaic of tectonic plates that move. New sea floor is created in areas where the plates pull apart, allowing new crustal material to be formed from the molten magma below the Earth’s surface. In this dataset, red is young sea floor and purple is old sea floor (280 million years old).
Plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth’s lithosphere, over the last hundreds of millions of years. The theoretical model builds on the concept of continental drift, an idea developed during the first few decades of the 20th century. The geoscientific community accepted plate-tectonic theory after seafloor spreading was validated in the late 1950s and early 1960s.
Reference: Age of the Seafloor (vegetation)
See earthview photo gallery with web-globe: LiVEARTH[:]