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Welcome to BBC Xtra English.

A new study by researchers at Bristol University suggests that early humans originated in sub Saharan Africa between 150 and 200 thousand years ago.

Previously, many believed that they moved up to the Mediterranean Sea by following the River Nile.

The researchers said that these early humans managed to survive the long journey because weather conditions were a lot wetter.

Radar images showed that there were fossil river channels between the desert and the Mediterranean Sea.

Scientists believe that these channels were formed from water flowing from volcanic mountains in the desert enabling life to grow.

That water would increase with rainfall from the monsoon rains.

A river would have run at this critical time and provided an alternative route for the travellers.

Do you know anything about your early ancestors? How far back can you trace your family history? Write to us in English.

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originated

نشأت

manage to

يستطيع ان

survive

بقى على قيد الحياة

investigated

حقق/تحرى

enabled

مكن

radar images

صور التقطت بالرادار

fossil river channels

حفريات مجاري الانهار

volcanic

بركاني

monsoon rains

أمطار موسمية

critical time

وقت حاسم

شروط وبنود الاستخدام