A liver hemangioma usually occurs as a single abnormal collection of blood vessels that is less than about 1.5 inches (about 4 centimeters) wide. Occasionally liver hemangiomas can be larger or occur in multiples. Large hemangiomas can occur in young children but this is very rare. In most people, a liver hemangioma will never grow and never cause any signs and symptoms. But in a small number of people, a liver hemangioma will grow to cause complications and require treatment. It's not clear why this happens.
When you set out to take in the Giant redwood trees of California, pack your camera and head south to the parkâs Mariposa Grove. Conveniently located near Yosemiteâs south entrance, Mariposa Grove is home to the Grizzly Giant sequoia, a leisurely 0.8 mile walk from the main parking lot. The oldest known giant redwood trees in California are more than 3,000 years old. 2  The bark of Giant Redwood Trees can be as thick as 4 feet, and helps make them fire resistant. 3  In addition, fires actually help redwoods survive by wiping out smaller trees that would eventually take over.
The ancient and spectacular redwood trees that dominate the Northern California Coastal Forests ecoregion are among the biggest, tallest, and oldest trees in the world. Many of these trees have been growing for more than 2,000 years, with some reaching heights of more than 90 meters (300 ft).