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.
Raymond and Ruth Perelman Donate $225 Million to the University of Pennsylvaniaâs School of Medicine. PHILADELPHIA -â The University of Pennsylvania has received a $225 million gift â- the largest single gift in its history -â from philanthropist Raymond G. Perelman and his wife, Ruth, to benefit Pennâs world-renowned School of Medicine.