Explanation:

<em><u>Bitcoin is a digital currency which operates free of any central control or the oversight of banks or governments. Instead it relies on peer-to-peer software and cryptography. A public ledger records all bitcoin transactions and copies are held on servers around the world</u></em>
A command economy is an economy in which production, investment, prices, and incomes are determined centrally by a government.
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the Union of South Africa was created as a self-governing dominion of the British Empire on 31 May 1910 in terms of the South Africa Act 1909, which amalgamated the four previously separate British colonies
Eight years after the end of the Second Boer War and after four years of negotiation, an act of the British Parliament (South Africa Act 1909) granted nominal independence, while creating the Union of South Africa on 31 May 1910
Its found near underwater mountain chains also known as mid-ocean ridges
Answer:
the change in birth and death rates
Explanation: