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حقائق وغرائب >> أسئلة فضولية
كيف ستكون الأرض بعد 500 سنة؟
حول الأرض في المستقبل: كيف ستكون الأرض بعد 500 سنة؟ سؤال ورد من «لوت»، بروكلن، ماساتشوستس. يستطيع العلماء القيام بتنبؤات دقيقة جداً حول المستقبل؛ لكن التنبؤ بحالة الأرض بعد 500 عام من الآن يعد مهمةً صعبة نظراً لوجود العديد من العوامل المؤثرة. تخيل «كريستوفر كولومبوس» في عام 1492 يحاول التنبؤ بحالة قارة أميركا اليوم! نحن نعلم أن هناك نوعان رئيسيان من العمليات يغيران كوكبنا؛ أحدهما يتضمن دوراتٍ طبيعيً؛ مثل الطريقة التي يدور بها الكوكب حول نفسه وحول الشمس، والآخر ناتج عن أشكال الحياة، وخاصةً البشر. الأرض نفسها تتغيّر الأرض تتغيّر باستمرار؛ إذ أنها تتأرجح، وتتغير زاوية ميلها وحتى مدارهها؛ مما…
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