Definition: This is a steep-sided canyon in the bottom of the ocean.

Beyond this slope is the abyssal plain (C), a smooth and nearly flat area of the ocean floor. In some places, deep, steep-sided canyons called trenches (G) cut into the abyssal plain. A continuous range of mountains called the mid-ocean ridge (D) winds around Earth. There are mountains on the abyssal plain, too.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

answer: the answer is b