DID YOU KNOW...?
In a quarter acre block of land, there are 1.8 tonnes of potassium (of which 2 kg is radioactive), 15 kg of radioactive thorium, and 5 kg of uranium (some of which is radioactive). Radioactivity keeps the Earth warm from the inside.
DID YOU KNOW...?
In a quarter acre block of land, there are 1.8 tonnes of potassium (of which 2 kg is radioactive), 15 kg of radioactive thorium, and 5 kg of uranium (some of which is radioactive). Radioactivity keeps the Earth warm from the inside.