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We could assume that this igneous intrusion must have happened after the formation of the strata.

If it had happened before the layers had formed, then we wouldn't see it punching through all the layers; we would only see it going through the layers that had existed at the time that it happened. The Principle of Cross-Cutting Relationships states that rock formations that cut across other rocks must be younger than the rocks that they cut across.

We follow this same idea, with a few variations, when we talk about cross-cutting relationships in rock.

Resources in this section pertain to the formation and evolution of the Earth and how it has been discovered through the relative and absolute dating of rocks and fossils.It sounds like common sense to you and me, but geologists have to define the Principle of Original Horizontality in order to make assumptions about the relative ages of sedimentary rocks. Say you have a layer of mud accumulating at the bottom of a lake. More sediment accumulates from the leaf litter and waste of the forest, until you have a second layer.Once we assume that all rock layers were originally horizontal, we can make another assumption: that the oldest rock layers are furthest toward the bottom, and the youngest rock layers are closest to the top. The forest layer is younger than the mud layer, right? When scientists look at sedimentary rock strata, they essentially see a timeline stretching backwards through history.Let's look at these rock strata here: We have five layers total.Let's say we find out, through numerical dating, that the rock layer shown above is 70 million years old.




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Oxford) Child Marriage in the Middle East and North Africa A Dowry for Mahrou (Short Film) Temporary Marriages In Iran I was a temporary bride - The Guardian (July 11, 2015) Iran talks up temporary marriages - BBC (June 2, 2007) Love Finds a Way in Iran: 'Temporary Marriage' - NY Times (October 4, 2000) Temporary Marriage in Iran (Qantara) In the Bazar of Sexes-Documentary by Sudabeh Mortezai Law of desire: temporary marriage in Shi'i Iran (online)-by Shahla Haeri Family Planning Iran birth drive 'turns women into baby-making machines' (BBC) How Iran Became One of the World's Most Futuristic Countries (i09) Iran's Family Planning Program: Responding to a Nation's Needs (PRB) Iran's Surprising and Shortsighted Shift on Family Planning - Newsecuritybeat (August 8, 2012) Iran Achieves Replacement-Level Fertility (PRB) Iran bans permanent contraception to boost population growth - The Guardian (August 11, 2014) Iran urges baby boom, slashes birth-control programs - AP (July 29, 2012) Iran's Birth Rate Plummeting at Record Pace: Success Provides a Model for Other Developing Countries - Earth Policy Institute (December 28, 2001) Men and Family Planning in Iran (Institute for Research on Planning & Development Iran) A Holistic Approach Underpins the Islamic Republic of Iran's Success in Family Planning (UNFPA) Iran's birth control policy sent birthrate tumbling (LA Times) Infertile in Iran - Le Monde Diplomatique (April 2008) Family Planning Association (NGO) Condom factory in Iran (Video) Condoms help check Iran birth rate - BBC (April 24, 2002) A Womb Can Be Rented For ,000 (Sharq Daily) Women and the Politics of Population Control in Iran-by Homa Hoodfar Abortion Abortion in Iran - Guttmacher Org (September 2008)-Provides a brief overview of abortion law and issues.


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