How does time affect the physical weathering
of a rock? (1 point)
The longer the rock has been exposed,
the more it has weathered.
Time does not affect physical
weathering, only chemical weathering.
Rock weathers the most when first
exposed, then more slowly.
Over time, the rock will become flat,
slowing the rate of physical weathering

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

maybe because its impossible for balloons to lift a whole entire house.