Lesson 1
One rocks forms, can they change?
True
Why does gravity cause layers of sediment to be horizontal?
Across the Earth's surface there is gravity, sediments will deposit parele of Earth's surface which is horizontal.
What is the best rock for radiometric dating?
The easiest are igneous rocks in which all crystals are roughly the same age, having solidified at about the same time.
What is relative dating?
Determining whether an object or event is older or younger than other objects or events is called relative dating.
How many spheres are there?
5
Fossils can tell us which animals lived at a certain time?
Sometimes
What are two ways that a rock layer can cause a gap in geologic record?
New rock layers can be worn away by erosion before they are covered by sediment, this makes a time gap in the rock layers. Younger rock layers are directly on top of very old rock layers.
Once a plant or animal dies, carbon is no longer taken in?
True
What is a fossil?
What is the atmosphere?
The atmosphere is mostly made of invisible gases that surround Earth.
The climent is exactly the same all over the world?
False
How are rock layers ordered?
The oldest sedimentary rock units are at the bottom, and the youngest are at the top.
What is a half-life?
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.
What is superposition?
The action of placing one thing on or above another, especially so that they coincide.
What is hydrosphere?
Hydrosphere is the water on earth
What are trace fossils?
It is the mold of something that died and decomposed.
How can scientists use erosion as a way to determine the relative ages of craters on Mars?
Scientists often compare the relative ages of craters by looking at how worn their features appear.
How can absolute age to rock be determined?
A process that behaves in a clock-like fashion and is a useful tool for determining the absolute age of rocks.
What is unconformity?
A surface of contact between two groups of unconformable strata.
What is the Earth system?
The Earth system is all of the matter, energy, and process within Earth's boundary.
What can fossils tell us?
They can tell us were animals/plants lived and sometimes died.
Would fossils of species that did not change noticeably over time be useful in determining the relative ages of rocks?
Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
A sample of wood contains 12.5% of its original carbon-14.What would the estimated age of this sample be?
17,000 yrs, The half-lives passed
What is geologic column?
A geologic column is an ordered arrangement of rock layers that is based on the relative ages of the rocks, with the oldest rock at the bottom in the column.
How do Earth's spheres interact?
Earth's spheres interact as matter and energy change and cycle between the five different spheres.