why do trees grow upwards

Trees grow up because they are trying to get closer to the sun, in order to fuel  the process of photosynthesis. 

why do trees lose their leaves

Trees lose their leaves seasonally a especially during Autumn, and to the shedding of other plant structures such as petals after flowering or fruit when ripe. 

material used to make cement

Gypsum is also used to make the cement set more slowly, The main ones are Limestone and Shale. 

what is the raw material used to make petrol

Petroleum, from Medieval Latin petroleum, from Latin petra rocklatin: oleum oil is a naturally occurring, yellow-to-black liquid found in geologic formations beneath the Earth's surface, which is commonly refined into various types of fuels. It consists of hydrocarbons of various molecular weights and other liquid organic compounds. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. Afossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and subjected intense heat and pressure.

what is the raw material used to make plastic

A plastic material is any of a wide rang of synthetic or semi-synthetic organic solids that are moldable plastics are typically organic polymers of high molecular mass, but they often contain other substances, The chemical composition of plastics is different depending on what type of plastic your dealing with But for the most part the raw material  of plastic is hydrocarbons found naturally in oil.