1.Land plants evolved during which era? 2. Which rock unit is the youngest? 3. W
ID: 111111 • Letter: 1
Question
1.Land plants evolved during which era?
2. Which rock unit is the youngest?
3. Which is the oldest rock unit?
4. Which is the correct definition of a half-life?
D. the time required for an isotope to acquire half of its mass
5. If the pressure and temperature on a rock increases to a point where the rock melts and becomes magma, on cooling it will become which of the following?
6. Which term describes changes to sediment in response to increasing pressure and temperature and the effects of fluids following burial?
D. metamorphism
7. How is a sedimentary rock that forms by the actions of organisms on it classified?
8. What type of metamorphism occurs adjacent to igneous intrusions?
9. A metamorphic rock's mineral assemblage is not the result of which of the following?
A. Cenozoic B. Mesozoic C. Paleozoic D. Proterozoic2. Which rock unit is the youngest?
A. chalk B. limestone C. sandstone D. mudstone3. Which is the oldest rock unit?
A. chalk B. limestone C. sandstone D. mudstoneExplanation / Answer
1) C. Paleozoic
The Paleozoic Era, which ran from about 542 million years ago to 251 million years ago, was a time of great change on Earth.The era began with the breakup of one supercontinent and the formation of another. Plants became widespread. And the first vertebrate animals colonized the land.
2) B.Limestone
Limestone is a sedimentary rock composed primarily of calcium carbonate in the form of the mineral calcite.
It most commonly forms in clear, warm, shallow marine waters
3) C.Sandstone
Sandstone is a sedimentary rock composed of sand-sized grains of mineral, rock, or organic material. It also contains a cementing material that binds the sand grains together and may contain a matrix of silt- or clay-size particles that occupy the spaces between the sand grains.
4) B. the time required for half of the beta decay in an isotope to occur
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