Lava is made up of crystals, volcanic glass, and bubbles (volcanic gases). As magma gets closer to the surface and cools, it begins to crystallize minerals like olivine and form bubbles of volcanic gases. When lava erupts it is made up of a slush of crystals, liquid, and bubbles. The liquid freezes to form volcanic glass. Chemically lava is made of the elements silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium (plus other elements in very small concentrations. Have a look at the background information in Minerals, Magma, and Volcanic Rocks.
The HoverJack has a weight limit of 1200 lbs. When lifting a heavy patient, extra caution must be taken to center him or her properly on the HoverJack. partners
Rating Newest Oldest. Best Answer: The weight limit is 25 lbs. but they also say you should not use it if you baby can sit up without help. The baby could tip in the seat and not be able to catch themself and they'd fall out. The instructions call it an active baby.