Answer
Pacific Plate, oceanic tectonic plate
Step-by-step explanation:
the large brown plate is pacific plate was under the ocean and also named after the ocean pacific ocean. so it is easy to guess
hope you understood it . it was my explanation up for more info down i have pasted what they told in google.
Pacific plate
In fact, six of the seven major tectonic plates are named after the continents they contain. The one exception is the Pacific plate, which lies beneath the Pacific Ocean. Not only is this the only major tectonic plate that is mainly underwater, it is also the largest, spanning over 100 million square kilometers.
Pacific Plate. The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At 103 million km2 (40 million sq mi), it is the largest tectonic plate. The Pacific Plate contains an interior hot spot forming the Hawaiian Islands.