What's limestone
In the very distance past, the skeleton remains of the shells of minute organisms, settled in thick beds on the ocean floors. Due to upheavals and shifting of the earth's crust, the layers were often put under great pressure, and eventually hardened into limestone rock.
Sedimentary rock and limestone in particular, because it is normally formed from the skeletons of mostly minute dead marine organisms.
Before making a weather forecast, weather forecasters "get in touch with the weather". They look at the weather that has happened in the past 24 hours. They look at the current weather. They look at local weather and weather for the whole hemisphere. They look for patterns in the weather. They use tools such as satellite, radar, and surface maps, to help them predict the weather. They also look at computer models of the weather. They collaborate with other meteorologists. Then they make their forecast!
A transformed plate margin is the plate that slides past each other
Typically, the best way to find average precipitation measurements for years past would be to look it up in an almanac.
Cause you keep looking at the clock at 36 past.
Most limestone was originally formed from sediments at the bottom of oceans, past and present.
It was the skeletons/shells of living animals and plants.
Happened is the past tense of happen.
Past defines a time that's already happened; the opposite of future. Passed is the past tense of pass meaning to move or cause to move in a specified direction.
Took a quick look is the past tense. It is the past tense of take a quick look. Take a quick look means to look at something quickly. Took a quick look means it happened in the past. eg Can you take a quick look at my essay and tell me what you think? I took a quick look at his essay and I don't think he has written enough.
Caused is already past tense. It's the past tense of cause.
This past week I visited a limestone quarry that has been mining limestone in one place for 40 years. In that time, they will have mined millions of tons of limestone. Usually nearly ALL the rock is limestone, so the answer will depend on the size (area) of the quarry, how deep you can mine, and presence of any "trash" rock.
The past participle of "look" is "looked".
The sedimentary rock, chalk, a form of limestone, was used in the past as a writing instrument on slate blackboards, but most 'chalk' today is actually gypsum.
Past tense means that the action happened in the past.
The past tense of happen is happened.