Snow and ice in the high latitudes generally do not melt even during the summer monthsâthey accumulate over time. Layers of snow fall and are covered by subsequent layers. As layers of snow accrue, their vertical thickness increases, and the snow transforms into ice as the air is squeezed out.
The brain is one of the most complex and magnificent organs in the human body. Our brain gives us awareness of ourselves and of our environment, processing a constant stream of sensory data. It controls our muscle movements, the secretions of our glands, and even our breathing and internal temperature.Every creative thought, feeling, and plan is developed by our brain.ur brain gives us awareness of ourselves and of our environment, processing a constant stream of sensory data. It controls our muscle movements, the secretions of our glands, and even our breathing and internal temperature. Every creative thought, feeling, and plan is developed by our brain.
1 BRAIN STEM: The part of the brain that connects to the spinal cord. 2  The brain stem controls functions basic to the survival of all animals, such as heart rate, breathing, digesting foods, and sleeping. CEREBRUM: This is the largest brain structure in humans and accounts for about two-thirds of the brainâs mass. 2  It is divided into two sides â the left and right hemispheresâthat are separated by a deep groove down the center from the back of the brain to the forehead.