According to Science Daily, the most significant geological event that happens in ocean trenches is the gradual subduction of the Earth's crust down into its mantle. This process takes tens of...
A blockchain â originally block chain â is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Each block contains typically a hash pointer as a link to a previous block, a timestamp and transaction data. By design, blockchains are inherently resistant to modification of the data.
the ropes or chains and blocks used in a hoisting tackle. block and tackle. A device consisting of a fixed pulley and a movable one, in which the rope attached to the load is passed over the fixed pulley, around the movable pulley, then back around the fixed one. Each pulley can have multiple grooves or wheels for the rope to pass over additional times.