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.
Melinda Gates and Bill Gates of the Gates Foundation, winners of the Public Service Award, are seen during the The Lasker Awards 2013. For the past five years, Bill and Melinda Gates have published an annual letter, modeled on Warren Buffettâs legendary Berkshire Hathaway shareholder missives, which help set the global philanthropic agenda.