The Change Over Time in the Ratio of Two Isotopes

question 30

Multiple Choice

The change over time in the ratio of two isotopes of __________ in the world ocean is the basis for much of stable isotope stratigraphy.

• A) thorium
• B) carbon
• C) strontium
• D) uranium

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Definitions:

Precava

Often referred to as the superior vena cava, it is a large vein that carries deoxygenated blood from the upper body to the heart.

Internal Jugular Vein

A major vein that carries blood from the head, brain, face, and neck back towards the heart.

Axillary Vein

A large blood vessel that conveys blood from the lateral aspects of the thorax, armpit, and upper limb toward the heart.

Brachiocephalic Vein

A large vein in the upper chest that is formed by the union of the internal jugular and subclavian veins and drains blood from the head, neck, and upper extremities.