Kanji info: チェルノブイリ原発事故

原

meadow, original, primitive, field, plain, prairie, tundra, wilderness

On'yomi: ゲン (gen)

Kun'yomi: はら (hara)

Radical components: 厂小白

Stroke order

発

departure, discharge, publish, emit, start from, disclose, counter for gunshots

On'yomi: ハツ (hatsu)、ホツ (hotsu)

Kun'yomi: た.つ (ta.tsu)、あば.く (aba.ku)、おこ.る (oko.ru)、つか.わす (tsuka.wasu)、はな.つ (hana.tsu)

Radical components: 二儿癶

Stroke order

事

matter, thing, fact, business, reason, possibly

On'yomi: ジ (ji)、ズ (zu)

Kun'yomi: こと (koto)、つか.う (tsuka.u)、つか.える (tsuka.eru)

Radical components: ヨ一亅口

Stroke order

故

happenstance, especially, intentionally, reason, cause, circumstances, the late, therefore, consequently

On'yomi: コ (ko)

Kun'yomi: ゆえ (yue)、ふる.い (furu.i)、もと (moto)

Radical components: 乞十口攵

Stroke order