IELTS Speaking topic: An educational trip

Describe an educational trip you went on.
You should say:
where this place was
what you did at this place
who you went there with
and explain why you thought this trip was educational.

Let me tell you about the Zhangye Danxia National Geological Park which is located near the city of Zhangye in China’s northwestern Gansu province. This place is well-known for its breathtaking colours of the rocks, which are very smooth, sharp and very tall. I went there two years ago with my friends to travel around to visit the numeric historical relics in the bumpy and dusty area of Hexi Corridor.

When I got there that day, I hiked along the board way in the mountainous area in the sunny morning and stayed there the whole day. What was really amazing was that the colours of the mountains changed continuously with the light of the day, showing yellow and red layers covered by a light grey layer. Standing in the viewing platform, I could enjoy the pictures of painted colours of endless mountains, especially during the sunset, and took loads of pictures there.

I was told by the guide that the unusual colours of the rocks were the result of red sandstone and mineral deposits being laid down over millions of years. The formation was formed by the erosion of red sandstone, which made the rock layers appear in different colours, textures and size. I was really educated geographically and stunned by the power of nature.