The subduction of plate tectonics causes an ocean trench to form. This means one of the Earth's tectonic plate slides under another tectonic plate. More » Science Earth Science Erosion & Weathering

The Tonga Trench is a submarine trench located in the floor of the South Pacific Ocean. It forms the eastern boundary of the Tonga Ridge. It's 35,702 feet deep at its deepest point and has an average depth of 20,000 feet... More » Science Earth Science Landforms

The Japan Trench is a submarine trench. It is located in the Pacific Ring of Fire in the North Pacific Ocean, roughly to the northeast of the Japanese islands. More » Geography Bodies of Water
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There are three places a volcano can occur: at mid-ocean ridges, at subduction zones where a continental and ocean plate collide, and at a hot spot located in the middle of a plate. Mid-ocean ridges are caused by diverge... More » Science Earth Science Volcanoes

According to, bays are formed through various ways, such as plate tectonics, overflowing of the ocean to a coastline and the slicing of a glacier through a bedrock. Bays are bodies of water partial... More » Science Earth Science Landforms

Lakes form due to receding glaciers, plate tectonics, volcanism, meandering rivers, landslides and human damming. Most of the natural lakes in North America formed due to glaciers receding from the last ice age 18,000 ye... More » Geography Bodies of Water

Two major forces that shape the surface of the Earth are the atmosphere and the ocean. These two things wear down mountains, turning them into sediments. These forces help form the landscapes of the Earth. More » Science Earth Science Erosion & Weathering