Until the early Proterozic there were only negligible amounts of free oxygen in the atmosphere
Answer:
Ice wedges are a big cause of potholes in roads and streets. As ice forms in the cracks of a street, the water expands and pushes against the surrounding rock, making the cracks wider, eventually breaking apart the rock.
Answer:
the Australian Capital Territory had the highest population density, at 171 people per sq km, followed by Victoria (27), New South Wales (9.7), and Tasmania Explanation:
27 is a factor of 54 so 27
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