Banded iron formations are composed of alternating light and dark bands of chert.
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What is chert?</h3>
- Banded iron formations are made up of alternating light and dark chert bands.
- Chert is a sedimentary rock that forms in a variety of ways and is almost entirely composed of silica (SiO 2).
- When the siliceous skeletons of marine plankton are dissolved during diagenesis, silica precipitates from the resulting solution, biochemical chert is formed.
- Chert layers, which occur as irregular beds or rounded nodules within limestone formations, are common in eastern Kansas.
- Because it is harder than limestone, chert is more resistant to erosion.
- The Flint Hills' chert-topped hills are the result of the landscape's uneven erosion.
Therefore, banded iron formations are composed of alternating light and dark bands of chert.
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Answer:
6 THINGS THAT MAKE LIFE ON EARTH POSSIBLE
Earth is well equipped as a planet and ideally placed in our solar system and galaxy to support life as we know it. The product of some 4.6 billion years of cosmic construction, our planet is flush with life thanks to a fortuitous set of conditions.
BY MANUEL CANALES, MATTHEW W. CHWASTYK, AND EVE CONANT
MANUEL CANALES, MATTHEW W. CHWASTYK, SOREN WALLJASPER, RYAN T. WILLIAMS, NGM STAFF; SEAN MCNAUGHTON
ART: ANTOINE COLLIGNON, TOMÁŠ MÜLLER
SOURCES: PETER D. WARD, UNIVERSITY OF WASHINGTON; KATE MAHER, STANFORD UNIVERSITY; KARINA A. YAGER, NASA GODDARD SPACE FLIGHT CENTER; JASON BARNES, UNIVERSITY OF IDAHO, GUILLERMO GONZALEZ, BALL STATE UNIVERSITY; MICHAEL GOWANLOCK, NORTHERN ARIZONA UNIVERSITY; ICARUS; ASTROBIOLOGY; NASA/JPL; INTERNATIONAL JOURNAL OF ASTROBIOLOGY
20,000
light-years
10,000
light-years
CORE
YOU ARE HERE
SOLAR SYSTEM
Proxima Centauri
AD Leonis
Eta Cassiopeiae A, B
Altair
Eta Cassiopeiae A, B
Altair
SUN
Procyon A, B
Alpha Centauri A, B
Sirius A, B
Delta Pavonis
SUN
Relative size
of the Earth
Solar flare
NEPTUNE
URANUS
SUN
EARTH
MERCURY
About 93 million miles
from Earth to Sun
VENUS
WE HAVE A BIG MOON TO
STABILIZE OUR AXIAL WOBBLE
MOON
EARTH
The moon is a
relatively large
2% of the Earth’s
volume.
Chemical factory fire, chemical spill turned the river red
Answer:
modified Aristotle view by making small circle around point that orbited the earth
Explanation:
This small circle he made about earth orbit were called epicycles and they allowed the earth move backward relative to the background stars
Answer: B. Metamorphic rocks
Explanation: Metamorphic rocks are those that have undergone changes due to extreme heat and pressure. Thus, the rock, from which it becomes a metamorphic rock, is heated at temperatures above 150-200 ° and exposed to a pressure of 1500 bar. In this way, the structure of the rock is changed, in terms of the arrangement of the atoms, and the result is a change of physical and chemical properties. There are two basic types of metamorphic rocks: foliated and slate. Generally, some of the metamorphic rocks are anthracite, schist, quartzite, marble, etc.
