Q 3 Write the short answer questions
1
What is called black gold ?
2 What are gemstones ? Name any two gamestones
3 What makes pumice float on water ?
4 Write two uses of limestone
5 What type of rock is limestone ? Where is it used ?
6 Name the metals you use in making jewellery
Answers
Answer:
1.Black gold is a term applied to oil or petroleum, which is black when it comes out of the ground and is worth a great deal of money. Prior to the mid-19 th century, oil from animal tallow (fat) and whale blubber was used as a lubricant and fuel.
2.A gemstone is the name given to a piece of mineral (or other rock or organic material) that after it has been cut and polished has been made into a piece of jewellery or another accessory.
Ex-topaz, tourmaline
3.pumice can float because of pockets of gas in its pores, it was unknown how those gases remain trapped inside the pumice for prolonged periods. If you soak up enough water in a sponge, for example, it will sink.
4.Uses of limestone
It can be used as a building material.
It is used in the production of cement by heating powdered limestone with clay.
5.sedimentary rock
Limestone is a sedimentary rock. It is formed by layers of small pieces of rock and stones pressed hard together.
Limestone has numerous uses: as a building material, an essential component of concrete (Portland cement), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a chemical feedstock for the production of lime, as a soil conditioner, and as a popular decorative
6.Metals Used in Jewelry
Gold.
Platinum.
Palladium.
Silver-Sterling.
Stainless Steel.
Titanium.
Tungsten.