Answer:
A) Magma emplacement
Explanation:
Sedimentary structures forms during deposition of sediments. It can also form after sediments have been deposited. Sedimentary structures can only be found in sedimentary rocks. Some examples include mud cracks, ripple marks, cross stratification, potholes, etc
Magma emplacement is an igneous process which describes the different mechanisms by which magma can be emplaced. It is only typical of igneous rocks.
Answer:
(a) 
(b) 
Explanation:
According to Newton's second law:
Recall that the frictional force is related jointly with the coefficient of friction and normal force 
. Replacing in the above equation, we get the coefficient of friction:
(a) The coefficient of static friction is related with the force required to set the block in motion:
(b) The coefficient of kinetic friction is related with the force required to keep the block moving with constant speed:
Its acceleration is constant.
Impulse = change in momentum
The answer is 0.
Answer:
A) A humidity level of 90 percent is too high.
Explanation:
A humidity level of 90% is too high . It reflects real or possible situation .
Atmospheric temperature between 20 - 30 degree makes comfortable weather. 70 or 80 or 90 degree atmospheric temperature is impossible to achieve on the earth in normal case. The maximum temperature upto which
atmospheric temperature has gone is 55 degree .
So all the other statements appear to be false.
