Attention-deficit/hyperactivity disorder (6.8%) was the most prevalent parent-reported current diagnosis among children aged 3â17 years, followed by behavioral or conduct problems (3.5%), anxiety (3.0%), depression (2.1%), autism spectrum disorders (1.1%), and Tourette syndrome (0.2% among children aged 6â17 years).
Most natural diamonds are formed at high temperature and pressure at depths of 140 to 190 kilometers (87 to 118 mi) in the Earth's mantle. Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).
How Are Diamonds Mined From the Earth. There are four main things we usually associate diamonds to when we see or hear about them. First, we think of how astonishing they would look on our partnerâs fingers. Next, we all know diamonds are the hardest substance on Earth even though many of us have a misconception they are unbreakable (in truth they are!). Also, some of us can relate to the industrial uses of diamonds as super heat sinks or drilling parts.