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.
Foundation Fact Sheet. 1  Bill Gates, Co-chair and Trustee. 2  Melinda Gates, Co-chair and Trustee. 3  William H. Gates Sr., Co-chair. 4  Sue Desmond-Hellmann, Chief Executive Officer. 5  Warren Buffett, Trustee. 6  Allan C. Golston, President, United States Program. 7  Chris Elias, President, Global Development. 8  Rodger Voorhies, Executive Director, Global Development.