D. Coal.
Coal is the most abundant fossil fuel. It is found most abundantly in the United States of America. It was said that coal reserves can are around 909 billion tonnes, which sustaining the same rate of usage, can be used for more than 100 years.
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Answer:
Many plant and animal species thrive in estuaries. The calm waters provide a safe area for small fish, shellfish, migrating birds and shore animals. The waters are rich in nutrients such as plankton and bacteria. This means the estuary must support a wide variety of food webs.
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Answer:
The old age stage streams.
Explanation:
The streams can be defined as a flow of water downhill when excess of water is shed from rainfall or snowmelt. The development of streams is divided into three stages the young stage, the mature stage, and the old age stage.
<u>The stage in which the stream valley becomes wider is the old age stage</u>.
The old age stage is the last stage of the three stages. In this stage, the streams slows down and begin cuttting down wider valley. The stream in this stage begiins to cut down the valley in wider range and equally. The stream begins to develop bends in this stage.
So, the correct answer is the old age stage stream.
