1. Physical Weathering. In physical weathering the rocks are broken down into smaller pieces, but the chemical composition of the rock remains the same. Temperature Change. Hot temperatures can give rise to thermal expansion in rocks and cool temperatures can cause rocks to contract.
Buffett Donates $2.8 Billion, Breaks Personal Giving Record. Warren Buffett has bested his own personal philanthropy record once again, donating $2.8 billion to the Bill and Melinda Gates Foundation and several other charities as part of his annual giving pledge. The gifts given Monday top last yearâs $2.6 billion donation.
Warren Buffett and Bill Gates are leading this effort by example. They are the two richest Americans and they have a combined net worth of more than $156 billion, according to the Bloomberg Billionaire Index. Also according to the index, the two have combined to put more than $46 billion into the Gates Foundation.