1.   As the Earth warmed and partial melting occurred, water was released and carried to the surface along with lava.

2.   On houses with cold roofs, that melting occurs from the top down, without ice dams.

3.   On houses with warm roofs, the melting occurs from the bottom up, creating the ice dam.

4.   When rapid melting occurs, large amounts of acidic water quickly run off from shrinking snowpacks.