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.
Bill Gates is chairman and chief software architect of Microsoft. Under Gates` leadership, Microsoft`s mission has been to improve software and to make it easier for people to use computers. He and his wife founded The Bill and Melinda Gates Foundation, which funds global health, education and public library projects. Independently produced for NPR by Jay Allison and Dan Gediman with John Gregory and Viki Merrick.