Gases in Earth's atmosphere absorb about 90 percent of this heat and radiate it back to the surface, which is warmed to a life-supporting average of 59 F (15 C). This very helpful process is called the greenhouse effect.
Anything that interrupts the normal connections between nerve cells in the brain can cause a seizure; this includes a high fever, low blood sugar, alcohol or drug withdrawal, or a brain concussion. Under these circumstances, anyone can have one or more seizures.
Presence or Absence of Convulsions. Seizures can cause muscle contractions called convulsions or they may occur without the muscles being involved. Seizures accompanied by convulsions are called grand mal seizures; seizures that occur without convulsions are called petit mal seizures.