A steppe is a large expanse of grasslands and few trees. So the choice of grassland with few trees would be your answer.
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Three well known types of tropical climate<span> are classified as the </span>Tropical <span>Rain forest, </span>Tropical <span>Monsoon,and lastly the </span>Tropical<span> Wet and Dry or more classically known as the Savannah. </span>
After two half-lives theres only going to be 25% of the original isotope, 75% of the decay product.
By looking at the satellite photograph below that shows the Mississippi River entering the Gulf of Mexico, the depositional feature in the Gulf of Mexico is best identified as a delta. A delta is when a river will divide itself into many other rivers and then goes into a larger water body.