Top 10 satellite images factsGeography quiz
Which desert has this famous "eye"? Sahara.
The Richat Structure in Mauritania, also known as the Eye of the Sahara, was interpreted as an asteroid impact structure, but no evidence of shock metamorphism has been found. Today, scientists believe that it is a huge (40 km in diameter) and deeply eroded geologic dome.
This is one of the largest cities in the world. Which one? Kinshasa.
Kinshasa (at the bottom of the photo) is an urban area with a 2013 population of over 9 million. It faces the capital of the neighbouring Republic of Congo, Brazzaville, which can be seen in the distance across the wide Congo River.
What are the circular objects visible on this satellite photo taken over Libya? Agricultural fields.
This is an astronaut photo of the Al Khufrah Oasis in Libya. The circular shape of fields is characteristic of center pivot irrigation. These fields are approximately 0.6 mile (1 kilometer) in diameter. Lighter colors indicate fields that have been harvested recently or just planted.
Which major city is this? Istanbul.
The city is easily recognizable due to the Bosphorus strait dividing it into two parts located on different continents. Istanbul's commercial and historical center is situated in Europe, while one third of its population live in Asia.
In this photo, you can see the impressive delta of the largest inflow of Caspian Sea. What's the river name? Volga.
The Volga Delta has grown significantly in the past century because of changes in the level of the Caspian Sea. In 1880, the delta had an area of 3,222 km². Today the Volga Delta covers an area of 27,224 km² and is approximately 160 km across.