D) gravel on the bottom of the aquarium. "Abiotic" means "non-living," so you would essentially pick the answer that does not include any organisms (the organisms here are plants, fish, and algae).
charcoal or water. water would considered an organic fuel because for one its organic and for two it is used to hydrate and to replenish life. if water was not here, everything would die.
Answer:
Igneous rocks are formed from cooled magma, magma is formed from melted metamorphic rock, metamorphic rock is formed from either heated igneous rock or heated and pressurized sedimentary rock, sedimentary rock is formed from sediments throught compaction and cemenetaion and sediments are formed from weathered and eroded igneous or metarmorphic rocks
Explanation:
For more info look up rock cycles and hit images for a simple format
