SCIENTIFIC EXPLANATIONS
EXPLANATION #1
The rock sample is a quartzite, which was possibly part of a river system or
beach prior to metamorphism. The rock is the color of sand and is difficult
to scratch or break. When the rock is heated layers form which prove the
river was metamorphosed.
EXPLANATION #2
The rock sample is a quartzite, which was possibly part of a river system
prior to metamorphism. The rock is made up almost of a single mineral,
which is harder than a nail and does not fizz in acid. It is also very hard and
it is not possible to pluck grains from the rock. Fine layers in the rock make
a pattern very similar to cross bedding. Recrystallization during
metamorphism fuses original sediment into a very hard material. I cannot
be a marble because the rock doesn’t fizz in acid. The lines that resemble
cross bedding are probably features created before the metamorphism.
The are very similar in appearance to cross bedding formed in today’s
rivers and beaches and unlike metamorphic layers, which don’t cut each
other off as these do.
EXPLANATION #3
The rock sample is a quartzite, which was possibly part of a river system
prior to metamorphism. The rock sample breaks across the grains, rather
than around them. The minerals are nearly all the same and have the
properties of quartz. The layers intersect in the same type of pattern as
ripple marks when looked at from the side. The hardness of the rock is a
dead give away and the layers seem right for a river.
SCIENTIFIC EXPLANATIONS
CLAIM = RED EVIDENCE = BLUE REASONING = PURPLE
EXPLANATION #1
The rock sample is a quartzite, which was possibly part of a river system or
beach prior to metamorphism (correct claim). The rock is the color of sand
and is difficult to scratch or break (incorrect evidence). When the rock is
heated layers form which prove the river was metamorphosed (incomplete,
confused or vague reasoning).
EXPLANATION #2
The rock sample is a quartzite, which was possibly part of a river system or
beach prior to metamorphism (correct claim). The rock is made up almost
of a single mineral, which is harder than a nail and does not fizz in acid. It is
also very hard and it is not possible to pluck grains from the rock. Fine
layers in the rock make a pattern very similar to cross bedding (correct
evidence). Recrystallization during metamorphism fuses original sediment
into a very hard material. I cannot be a marble because the rock doesn’t
fizz in acid. The lines that resemble cross bedding are probably features
created before the metamorphism. The are very similar in appearance to
cross bedding formed in today’s rivers and beaches and unlike
metamorphic layers, which don’t cut each other off as these do. (correct
reasoning).
EXPLANATION #3
The rock sample is a quartzite, which was possibly part of a river system or
beach prior to metamorphism (correct claim). The rock sample breaks
across the grains, rather than around them. The minerals are nearly all the
same and have the properties of quartz. The layers intersect in the same
type of pattern as ripple marks when looked at from the side. (correct
evidence). The hardness of the rock is a dead give away and the layers
seem right for a river (correct, but incomplete reasoning).