How has the European Union improved the lives of European citizens?

Which domain endings indicate websites that are most likely to be reliable sources? check all that apply. sites ending in .net

What are two australian geographical features that hindered early exploration? western plateau gulf of carpentaria great barrier reef great dividing range

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed