It is called a warm front when a warm air mass moves into an area where a cold air mass is located based on the blanked sentence above. A warm front is a condition where a warm air mass is replacing a cold air in a place. The character of a warm front condition is an increasing in temperature of a place which is caused by the moving warm air mass<span>.</span>
The pia mater<span> is the innermost layer of the meninges and attaches directly to the brain and spinal cord.</span>
Your answer is Because of gravity
acceleration due to gravity is always 9.8 m/s/s (on earth)
