Why are Bitcoin Cash and Bitoin Gold Rising so fast?

BitCoin the original currency has split into 6 forks.

6 Coin Forks that have happened so far:

  1. Bitcoin Cash (Forked at Block 478559, 1 August 2017)
  2. Bitcoin Gold (Forked at Block 491407, 24 October 2017)
  3. Bitcoin Diamond (Forked at Block 495866, 24 November 2017)
  4. UnitedBitcoin (Forked at Block 498777, 12 December 2017)
  5. BitcoinX (Forked at Block 498888, 12 December 2017)
  6. Super Bitcoin (Forked at Block 498888, 12 December 2017)

Bitcoin Cash and Bitcoin Gold are having an enormous rise in prices, Why?

Bitcoin Cash (7 Day Chart)

Bitcoin Gold (7 Day Chart)