More buildings and more space for humans to move around
Answer:
Changes in the pressure create the flow of the air to move up and down in the ear and thus create popping sound.
Explanation:
- The ear-popping is caused by the phenomenon of the opening of the Eustachian tube when one swallows and it might be automatically when you blow our nose or are setting in an airplane and this sound is created when the air enters the middle ear through the tube.
The answer is Crude birth rate
Answer:
According to one estimate, stands of century-old forest now account for only 7% of forest cover in the United States (USDA-FS 2000). Since 1600, 90% of the virgin forests that once covered much of the lower 48 states have been cleared away.
Explanation:
Mount Baker-Snoqualmie National Forest, Washington
The Mount Baker-Snoqualmie forest is located in the Cascade mountain range in Washington state and is home to 644,000 acres of old-growth. Situated around an hour away from the Seattle metropolitan area, this forest is one of the most frequently visited in the country.
<span>The largest mass extinction in Earth's history, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic to recover.[1] Recovery of life in the sea may have been much faster." </span>
