A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type ... the rock malachite is mostly made of the compound copper carbonate ...

Carbonate rock such as limestone should have ... the hope is that Perseverance will chance upon outcroppings of these precious rock types that have been unearthed in the mighty impact that formed ...

Carbonates are sedimentary rocks formed by layers of carbonate sediment laid down by marine organisms ... as 10 per cent compared with average recovery rates for all reservoir types of 35 per cent.