00:00 You won't believe what your dog might find if it kept digging in the sand.
00:04 Well, what you will find underneath the sand depends on where you are.
00:08 Sand dunes can move with the wind, revealing hidden forests or even sinkholes that might
00:13 swallow you.
00:14 If you dig down at the beach, you might find sand that's been turned into the sedimentary
00:18 rock sandstone.
00:20 And if you keep digging even deeper, now with advanced equipment, you'll eventually reach
00:25 the solid bedrock.
00:26 In deserts, you won't often need to dig – they're mostly rocky.
00:31 Desert sand forms from rock erosion due to temperature changes and wind.
00:35 So if you dig there, you'll eventually hit solid rock and dry clay.
00:40 But sand might be hiding a few fascinating geological surprises too.
00:44 For example, in 2010, scientists found evidence of a prehistoric mega-lake beneath the sands
00:51 of the Sahara.
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